Snowflake obsidian
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<section class="snowflake-obsidian-entry" style="--accent: #0ea5e9; --accent-2: #111827; --accent-3: #10b981; --ink: #0f172a; --muted: #64748b; --paper: #ffffff; --soft: #eff6ff; --line: #e5e7eb; --shadow: 0 10px 30px rgba(2,6,23,.06); color-scheme: light; font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, Apple Color Emoji, Segoe UI Emoji; background: var(--paper); color: var(--ink); line-height: 1.7; max-width: 1120px; margin: 0 auto; padding: 2.8rem 1.25rem;"><!-- HERO --><header class="hero">
<div style="display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: .75rem;">
<span class="badge">Snowflake Obsidian • natural <strong>volcanic glass</strong> (rhyolitic) with <strong>cristobalite spherulites</strong></span> <span class="badge">Structure: <strong>amorphous</strong> base glass • Texture: black glass with <strong>radial white “snowflakes”</strong></span> <span class="badge">Mohs: <strong>~5–5.5</strong> • SG: <strong>~2.35</strong> • Luster: <strong>vitreous</strong> • Fracture: <strong>conchoidal</strong> (shell‑like)</span> <span class="badge">Family: obsidian varieties include <strong>mahogany</strong>, <strong>silver sheen</strong>, <strong>rainbow</strong>—this one is the winter edition</span>
</div>
<h1>Snowflake Obsidian — Winter Sky Frozen in Glass</h1>
<p class="lede"><strong>Snowflake obsidian</strong> is midnight‑black volcanic glass sprinkled with pale, feathery “flakes.” Those flakes aren’t paint: they’re <em>spherulites</em>—tiny, radial growths of the mineral <strong>cristobalite</strong> that bloom in the glass as it slowly devitrifies. The result looks like snowfall paused mid‑air and set forever in stone. Cozy to look at, cool to learn about.</p>
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<section class="grid-3" style="margin-top: 1rem;">
<div class="kpi">
<div class="icon">🧪</div>
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<div class="label" style="color: var(--muted); font-size: .9rem;">What it is</div>
<div class="value" style="font-weight: bold;">A <strong>high‑silica volcanic glass</strong> (SiO₂‑rich) where white <strong>cristobalite spherulites</strong> formed inside the glass, creating a snowy pattern</div>
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</div>
<div class="kpi">
<div class="icon">❄️</div>
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<div class="label" style="color: var(--muted); font-size: .9rem;">Why it captivates</div>
<div class="value" style="font-weight: bold;">Graphic contrast: inky black base + soft <strong>snow‑star bursts</strong>; polishes to a mirror that makes the flakes glow</div>
</div>
</div>
<div class="kpi">
<div class="icon">🧼</div>
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<div class="label" style="color: var(--muted); font-size: .9rem;">Care snapshot</div>
<div class="value" style="font-weight: bold;">Glass = <strong>brittle</strong>; protect from knocks & sharp drops; mild soap + water; avoid thermal shock and harsh chemicals</div>
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</div>
</section>
<!-- TOC --><nav class="toc"><strong>Contents</strong>
<div class="grid-3" style="margin-top: .55rem;">
<div>
<a href="#identity">Identity & Naming</a><br><a href="#formation">How the “Snowflakes” Form</a><br><a href="#appearance">Palette & Pattern Vocabulary</a>
</div>
<div>
<a href="#properties">Physical Details</a><br><a href="#loupe">Under the Loupe</a><br><a href="#lookalikes">Look‑Alikes & Mix‑ups</a>
</div>
<div>
<a href="#localities">Localities & Uses</a><br><a href="#care">Care, Jewelry & Lapidary</a><br><a href="#fun">Hands‑On Demos</a><br><a href="#faq">Questions</a>
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</nav><hr>
<section id="identity">
<h2>Identity & Naming 🔎</h2>
<div class="grid-2">
<div class="card">
<h3>Volcanic glass with winter blooms</h3>
<p><strong>Obsidian</strong> forms when silica‑rich lava cools so quickly that crystals don’t have time to grow—result: glass. In some flows, residual heat and fluids later coax <strong>cristobalite</strong> to crystallize in <em>radial, snowflake‑like</em> patches. Hence the name.</p>
</div>
<div class="card">
<h3>Devitrification in action</h3>
<p>Those “flakes” are the rock slowly <strong>devitrifying</strong>—moving from glass toward microcrystalline quartz polymorphs. It’s geology’s way of doodling in the margins.</p>
</div>
</div>
<div class="note" style="margin-top: .6rem;">
<strong>Fun aside:</strong> Under strong backlight, the black glass sometimes shows a cola‑brown edge—classic obsidian clue.</div>
</section>
<hr>
<section id="formation">
<h2>How the “Snowflakes” Form 🧭</h2>
<div class="grid-3">
<div class="card">
<h3>Spherulite nucleation</h3>
<p>Tiny seed points in the glass start to crystallize as <strong>cristobalite</strong>. Needles radiate outward, creating circular or star‑shaped patches that lighten the black.</p>
</div>
<div class="card">
<h3>Growth & spacing</h3>
<p>Flake size and density reflect cooling history: slow, even conditions make larger, well‑spaced “snow”; faster changes make finer, crowded flurries.</p>
</div>
<div class="card">
<h3>Flow memory</h3>
<p>Some pieces preserve faint <strong>flow banding</strong>—subtle grey ribbons within the black glass—with snowflakes perched on top like a winter stream.</p>
</div>
</div>
<blockquote>Recipe: rhyolitic lava + quick chill → glass; add time + warmth → snowflake spherulites.</blockquote>
</section>
<hr>
<section id="appearance">
<h2>Palette & Pattern Vocabulary 🎨</h2>
<div class="grid-2">
<div class="card">
<h3>Palette</h3>
<ul>
<li>
<span class="swatch" style="background: #0b1320;"></span> <strong>Ink black</strong> — the glass matrix.</li>
<li>
<span class="swatch" style="background: #e5e7eb;"></span> <strong>Frost grey to white</strong> — cristobalite “flakes.”</li>
<li>
<span class="swatch" style="background: #4b5563;"></span> <strong>Smoky halos</strong> — diffuse rims around larger spherulites.</li>
</ul>
<p>High polish gives a <strong>mirror sheen</strong> that makes the flakes appear suspended just beneath the surface.</p>
</div>
<div class="card">
<h3>Pattern words</h3>
<ul>
<li>
<strong>Spherulites</strong> — round, radial crystal sprays (the “snowflakes”).</li>
<li>
<strong>Rosettes</strong> — clustered flakes forming larger blossoms.</li>
<li>
<strong>Flow bands</strong> — subtle ribbons in the glass from viscous movement.</li>
<li>
<strong>Hackle marks</strong> — tiny feather‑like lines near natural fractures.</li>
</ul>
<p class="tip" style="margin-top: .5rem;"><strong>Photo tip:</strong> Use a large, soft key light to keep the black rich; add a small side light to give each flake a gentle halo without glare.</p>
</div>
</div>
</section>
<hr>
<section id="properties">
<h2>Physical Details 🧪</h2>
<table class="table">
<thead>
<tr>
<th>Property</th>
<th>Typical Range / Note</th>
</tr>
</thead>
<tbody>
<tr>
<td>Composition</td>
<td>Silica‑rich volcanic glass (rhyolitic), with <strong>cristobalite</strong> (SiO₂) spherulites</td>
</tr>
<tr>
<td>Structure</td>
<td>
<strong>Amorphous</strong> base (no long‑range crystal order); devitrification creates microcrystalline patches</td>
</tr>
<tr>
<td>Hardness (Mohs)</td>
<td>
<strong>~5–5.5</strong> (softer than quartz; protect from abrasion)</td>
</tr>
<tr>
<td>Specific gravity</td>
<td>
<strong>~2.35</strong> (light for a rock glass)</td>
</tr>
<tr>
<td>Fracture</td>
<td>
<strong>Conchoidal</strong> with sharp edges; no cleavage</td>
</tr>
<tr>
<td>Luster / Transparency</td>
<td>Vitreous; <strong>opaque</strong> with <em>translucent brown edges</em> in very thin chips</td>
</tr>
<tr>
<td>Treatments</td>
<td>None typical; patterns are natural. Avoid coatings that mute the mirror finish</td>
</tr>
</tbody>
</table>
<div class="note" style="margin-top: .6rem;">
<strong>Plain‑English ID:</strong> mirror‑black glass with round, soft‑edged white “flakes”; glassy chips, no grainy sparkle, no acid fizz.</div>
</section>
<hr>
<section id="loupe">
<h2>Under the Loupe 🔬</h2>
<div class="grid-3">
<div class="card">
<h3>Spherulite texture</h3>
<p>Each flake shows <strong>radial fibrous structure</strong> (like tiny spokes) and often a slightly darker core where nucleation began.</p>
</div>
<div class="card">
<h3>Glass clues</h3>
<p>Edges of chips display <strong>shell‑like curves</strong> and fine hackle lines—classic glass fracture not seen in crystalline jaspers.</p>
</div>
<div class="card">
<h3>Flow bands</h3>
<p>Look for faint, parallel wisps in the black—vestiges of lava movement before the glass froze.</p>
</div>
</div>
</section>
<hr>
<section id="lookalikes">
<h2>Look‑Alikes & Mix‑ups 🕵️</h2>
<div class="grid-3">
<div class="card">
<h3>Black jasper with orbs</h3>
<p>Jasper is <strong>microcrystalline quartz</strong> (harder, ~7) and breaks granular, not glassy. Its white spots lack the <em>radial fibrous</em> look of spherulites.</p>
</div>
<div class="card">
<h3>Man‑made glass</h3>
<p>Some glasses mimic the look but often show <strong>uniform bubbles</strong> and lack true spherulite spokes under magnification.</p>
</div>
<div class="card">
<h3>Dalmatian “jasper”</h3>
<p>Spots on a <strong>beige</strong> feldspar‑quartz rock, not black glass; speckles are angular minerals, not radial snowflakes.</p>
</div>
<div class="card">
<h3>Quick checklist</h3>
<ul>
<li>Mirror‑black, <strong>conchoidal</strong> chips?</li>
<li>Round, <strong>radial</strong> white flakes (not crisp dots)?</li>
<li>Thin edges glow brown in strong light? → Snowflake obsidian.</li>
</ul>
</div>
</div>
</section>
<hr>
<section id="localities">
<h2>Localities & Uses 📍</h2>
<div class="grid-2">
<div class="card">
<h3>Where it shines</h3>
<p>Notable sources include <strong>Mexico</strong> (Sierra de las Navajas), the <strong>USA</strong> (Oregon’s Glass Buttes, Yellowstone region), parts of <strong>Turkey</strong>, <strong>Armenia</strong>, and <strong>Iceland</strong>. Anywhere rhyolitic volcanism occurs, obsidian may, too—snowflake patterns are a happy after‑story.</p>
</div>
<div class="card">
<h3>How people use it</h3>
<p>Polished <strong>cabochons</strong>, <strong>beads</strong>, <strong>carvings</strong>, and smooth palm stones. Historically, obsidian’s <strong>razor‑sharp edges</strong> made it a go‑to for blades and points (today, it’s mostly for display and jewelry).</p>
</div>
</div>
<div class="note" style="margin-top: .6rem;">
<strong>Labeling idea:</strong> “Snowflake obsidian — volcanic glass with cristobalite spherulites — mirror polish — locality.” Short, descriptive, accurate.</div>
</section>
<hr>
<section id="care">
<h2>Care, Jewelry & Lapidary 🧼💎</h2>
<div class="grid-3">
<div class="card">
<h3>Everyday care</h3>
<ul>
<li>Mild <strong>soap + lukewarm water</strong>; soft cloth dry.</li>
<li>Protect from <strong>hard knocks</strong>—glass is brittle.</li>
<li>Avoid long ultrasonic/steam cycles and sudden temperature swings.</li>
</ul>
</div>
<div class="card">
<h3>Jewelry guidance</h3>
<ul>
<li>Great for <strong>pendants, earrings, beads</strong>; rings benefit from protective settings.</li>
<li>Store separately—quartz and corundum can scratch it.</li>
<li>High polish shows fingerprints; a quick microfiber refresh brings back the mirror.</li>
</ul>
</div>
<div class="card">
<h3>On the wheel</h3>
<ul>
<li>Light pressure; obsidian can “orange‑peel” with heat.</li>
<li>Pre‑polish to 3k–8k diamond; finish with <strong>cerium oxide</strong> on felt/leather for a piano‑black gloss.</li>
<li>Chamfer edges slightly to reduce chipping during setting.</li>
</ul>
</div>
</div>
<div class="tip">
<strong>Display tip:</strong> A charcoal plinth and soft side light make the flakes appear luminous, like snow at dusk.</div>
</section>
<hr>
<section id="fun">
<h2>Hands‑On Demos 🔍</h2>
<div class="grid-2">
<div class="card">
<h3>Backlight edge</h3>
<p>Hold a thin piece to a strong light: the <strong>brown edge glow</strong> confirms volcanic glass and delights every first‑time viewer.</p>
</div>
<div class="card">
<h3>Snowflake anatomy</h3>
<p>With a 10× loupe, trace the <strong>radial spokes</strong> of a flake from center to rim. That’s cristobalite writing its name in tiny lines.</p>
</div>
</div>
<blockquote>One part lava, one part time, a pinch of winter—shake gently and polish.</blockquote>
</section>
<hr>
<section id="faq">
<h2>Questions ❓</h2>
<p><strong>Are the snowflakes painted or dyed?</strong><br>No. They’re <strong>natural cristobalite spherulites</strong> that formed inside the glass.</p>
<p><strong>Will the pattern change over time?</strong><br>It’s stable at room conditions. The devitrification that made the flakes happened in the geological past.</p>
<p><strong>Is snowflake obsidian magnetic?</strong><br>No—trace iron can be present, but it’s generally <strong>non‑magnetic</strong>.</p>
<p><strong>Does it scratch easily?</strong><br>It’s mid‑hard (Mohs ~5–5.5) but <strong>brittle</strong>. Avoid hard impacts and store away from harder stones.</p>
<p> </p>
<p>https://www.crystals.eu/blogs/crystals-o/hearth-snow-a-legend-of-snowflake-obsidian</p>
<p>https://www.crystals.eu/blogs/crystals-o/snowflake-obsidian-physical-optical-characteristics</p>
<p>https://www.crystals.eu/blogs/crystals-o/snowflake-obsidian-mythical-magic-uses-a-practical-guide</p>
<p>https://www.crystals.eu/blogs/crystals-o/snowflake-obsidian-legends-myths-a-global-survey</p>
<p>https://www.crystals.eu/blogs/crystals-o/snowflake-obsidian-history-cultural-significance</p>
<p>https://www.crystals.eu/blogs/crystals-o/snowflake-obsidian-grading-localities</p>
<p>https://www.crystals.eu/blogs/crystals-o/snowflake-obsidian-formation-geology-varieties</p>
<p>https://www.crystals.eu/blogs/crystals-o/hearth-snow-compass-a-snowflake-obsidian-spell</p>
</section>
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