Crystals
Feldspar
Feldspar Group • Tectosilicates Two Series: Alkali (K‑Na) & Plagioclase (Na‑Ca) Mohs ~6–6.5 • Two Cleavages at ~90° Feldspar 🔶 — The Quiet Superstar of Earth’s Crust (and the Spark...
Feldspar
Feldspar Group • Tectosilicates Two Series: Alkali (K‑Na) & Plagioclase (Na‑Ca) Mohs ~6–6.5 • Two Cleavages at ~90° Feldspar 🔶 — The Quiet Superstar of Earth’s Crust (and the Spark...
Dinosaur bone
Dinosaur Bone • Vertebrate Fossil Agatized / Permineralized (“Gembone”) Age: Late Triassic–Cretaceous (varies by locality) Hardness: ~6.5–7 (silica) • ~3–4 (calcite) Dinosaur Bone 🦴 — Ancient Architecture in Mosaic Not...
Dinosaur bone
Dinosaur Bone • Vertebrate Fossil Agatized / Permineralized (“Gembone”) Age: Late Triassic–Cretaceous (varies by locality) Hardness: ~6.5–7 (silica) • ~3–4 (calcite) Dinosaur Bone 🦴 — Ancient Architecture in Mosaic Not...
Celestine
Celestine (a.k.a. Celestite) Strontium Sulfate • SrSO4 Orthorhombic • Mohs 3–3.5 • SG ~3.9 Celestine 🌤️ — Sky‑Blue Crystals, Calm Light, and a Touch of the “Heavenly” As soothing as...
Celestine
Celestine (a.k.a. Celestite) Strontium Sulfate • SrSO4 Orthorhombic • Mohs 3–3.5 • SG ~3.9 Celestine 🌤️ — Sky‑Blue Crystals, Calm Light, and a Touch of the “Heavenly” As soothing as...
Brucite
Magnesium Hydroxide • Mg(OH)2 Trigonal • Layered Sheets Mohs ~2.5–3 • SG ~2.3–2.4 Brucite 🌿 — Soft Glow, Layered Science, and That Dreamy Sky‑Blue Gently silky, sometimes bright blue, and...
Brucite
Magnesium Hydroxide • Mg(OH)2 Trigonal • Layered Sheets Mohs ~2.5–3 • SG ~2.3–2.4 Brucite 🌿 — Soft Glow, Layered Science, and That Dreamy Sky‑Blue Gently silky, sometimes bright blue, and...
Blue tiger eye
Quartz Variety (Chatoyant) “Hawk’s Eye” • Crocidolite → Quartz Pseudomorph Mohs 7 • SiO2 Blue Tiger’s Eye 💙🪶 — Hawk’s‑Eye Calm, Steel‑Blue Glow Sleek bands of midnight‑to‑sky blue that slide...
Blue tiger eye
Quartz Variety (Chatoyant) “Hawk’s Eye” • Crocidolite → Quartz Pseudomorph Mohs 7 • SiO2 Blue Tiger’s Eye 💙🪶 — Hawk’s‑Eye Calm, Steel‑Blue Glow Sleek bands of midnight‑to‑sky blue that slide...
Black onyx
Black Onyx • straight‑banded chalcedony (microcrystalline SiO₂) Palette: black base with white/grey cap (cameo grade) • also solid black cabs Mohs: ~6.5–7 • SG: ~2.58–2.64 • Luster: waxy‑vitreous • Cleavage:...
Black onyx
Black Onyx • straight‑banded chalcedony (microcrystalline SiO₂) Palette: black base with white/grey cap (cameo grade) • also solid black cabs Mohs: ~6.5–7 • SG: ~2.58–2.64 • Luster: waxy‑vitreous • Cleavage:...