Crystals
Smoky quartz
Smoky Quartz • macrocrystalline SiO₂ Color cause: radiation‑induced color centers (Al‑substitution + natural irradiation) Mohs ~7 • SG ~2.65 • RI ~1.544–1.553 • No cleavage • Trigonal Varieties: cairngorm (warm...
Smoky quartz
Smoky Quartz • macrocrystalline SiO₂ Color cause: radiation‑induced color centers (Al‑substitution + natural irradiation) Mohs ~7 • SG ~2.65 • RI ~1.544–1.553 • No cleavage • Trigonal Varieties: cairngorm (warm...
Snakeskin jasper
Snakeskin Jasper • opaque chalcedony (microcrystalline quartz) — SiO₂ Look: wavy “ribbons”, reticulated “scale” veining, scenic banding Mohs: ~6.5–7 • SG: ~2.58–2.64 • Luster: waxy–vitreous • Fracture: conchoidal Color agents:...
Snakeskin jasper
Snakeskin Jasper • opaque chalcedony (microcrystalline quartz) — SiO₂ Look: wavy “ribbons”, reticulated “scale” veining, scenic banding Mohs: ~6.5–7 • SG: ~2.58–2.64 • Luster: waxy–vitreous • Fracture: conchoidal Color agents:...
Apache tear
Apache Tear • rounded nodules of obsidian (volcanic glass) Family: Rhyolitic glass (SiO₂‑rich) • Structure: amorphous Hardness: ~5–5.5 • SG: ~2.3–2.5 • Luster: vitreous Signature move: looks black… but glows...
Apache tear
Apache Tear • rounded nodules of obsidian (volcanic glass) Family: Rhyolitic glass (SiO₂‑rich) • Structure: amorphous Hardness: ~5–5.5 • SG: ~2.3–2.5 • Luster: vitreous Signature move: looks black… but glows...
Lapis lazuli
Lapis lazuli • metamorphic rock rich in lazurite (sodalite group), with calcite & pyrite Color cause (lazurite): S3− radical anions + related sulfur species Hardness: ~5–5.5 • SG: ~2.7–2.9 •...
Lapis lazuli
Lapis lazuli • metamorphic rock rich in lazurite (sodalite group), with calcite & pyrite Color cause (lazurite): S3− radical anions + related sulfur species Hardness: ~5–5.5 • SG: ~2.7–2.9 •...
Crazy lace agate
Quartz Family (Chalcedony) “Laughter Stone” Mohs 6.5–7 Crazy Lace Agate 🎉 — The Joyful Swirls of Mexico An upbeat guide to the warm, wavy agate that looks like confetti cake...
Crazy lace agate
Quartz Family (Chalcedony) “Laughter Stone” Mohs 6.5–7 Crazy Lace Agate 🎉 — The Joyful Swirls of Mexico An upbeat guide to the warm, wavy agate that looks like confetti cake...
Crinoide fossil
Crinoid Fossil • “Sea Lily” Class Crinoidea • Phylum Echinodermata Age: Ordovician–Recent (peak Mississippian) Typical Composition: Calcite • Sometimes Silicified Crinoid Fossil 🌊 — Ocean Ferns Carved in Stone They...
Crinoide fossil
Crinoid Fossil • “Sea Lily” Class Crinoidea • Phylum Echinodermata Age: Ordovician–Recent (peak Mississippian) Typical Composition: Calcite • Sometimes Silicified Crinoid Fossil 🌊 — Ocean Ferns Carved in Stone They...