Kristalopedia
Blue quartz
Blue quartz • macrocrystalline SiO₂ Color cause: submicroscopic inclusions (dumortierite • riebeckite/crocidolite • rutile “dust”) + light scattering Mohs ~7 • SG ~2.65 • RI ~1.544–1.553 • No cleavage •...
Blue quartz
Blue quartz • macrocrystalline SiO₂ Color cause: submicroscopic inclusions (dumortierite • riebeckite/crocidolite • rutile “dust”) + light scattering Mohs ~7 • SG ~2.65 • RI ~1.544–1.553 • No cleavage •...
Blue calcite
Calcite family • CaCO3 Trigonal (rhombohedral) • Strong double refraction Mohs ~3 Blue calcite 🌥️ — soft sky calmness, everyday beauty Soothing like a quiet morning—soft blue tones, velvety polish,...
Blue calcite
Calcite family • CaCO3 Trigonal (rhombohedral) • Strong double refraction Mohs ~3 Blue calcite 🌥️ — soft sky calmness, everyday beauty Soothing like a quiet morning—soft blue tones, velvety polish,...
Copper
Copper • Cu (natural element) Isometric (cubic) • FCC metal Mohs ~2.5–3 • SG ~8.96 Highly conductive • Malleable • Ductile Copper 🧡 — warm metal, old history, modern style...
Copper
Copper • Cu (natural element) Isometric (cubic) • FCC metal Mohs ~2.5–3 • SG ~8.96 Highly conductive • Malleable • Ductile Copper 🧡 — warm metal, old history, modern style...
Rubies with fuchsite
Ruby in fuchsite • metamorphic rock Composition: Ruby (corundum, Al₂O₃ + Cr³⁺) in a fuchsite (Cr-rich muscovite mica) matrix Contrast: Mohs 9 (ruby) vs ~2–3 (fuchsite) Appearance: cherry–crimson ruby spots...
Rubies with fuchsite
Ruby in fuchsite • metamorphic rock Composition: Ruby (corundum, Al₂O₃ + Cr³⁺) in a fuchsite (Cr-rich muscovite mica) matrix Contrast: Mohs 9 (ruby) vs ~2–3 (fuchsite) Appearance: cherry–crimson ruby spots...
Rubies with Zoisite
Ruby in zoisite • “Anyolite” (metamorphic rock) Composition: Ruby (corundum, Al₂O₃ + Cr³⁺) in a zoisite matrix (Ca₂Al₃(SiO₄)(Si₂O₇)O(OH)) Accents: black amphibole (hornblende group) bands, ± quartz Hardness contrast: Ruby 9...
Rubies with Zoisite
Ruby in zoisite • “Anyolite” (metamorphic rock) Composition: Ruby (corundum, Al₂O₃ + Cr³⁺) in a zoisite matrix (Ca₂Al₃(SiO₄)(Si₂O₇)O(OH)) Accents: black amphibole (hornblende group) bands, ± quartz Hardness contrast: Ruby 9...
Moonstone
Moonstone • feldspar with adularescence Classic variety: orthoclase–albite intergrowths (K-feldspar + Na-feldspar) Mohs ~6–6.5 • SG ~2.56–2.60 • Cleavage: two directions (good) Optics: RI ~1.518–1.526 • Birefringence ~0.005–0.009 • Phenomena:...
Moonstone
Moonstone • feldspar with adularescence Classic variety: orthoclase–albite intergrowths (K-feldspar + Na-feldspar) Mohs ~6–6.5 • SG ~2.56–2.60 • Cleavage: two directions (good) Optics: RI ~1.518–1.526 • Birefringence ~0.005–0.009 • Phenomena:...