Kristalopedia
Zoisitas
Zoisite • orthorhombic sorosilicate; clinozoisite polymorph Formula (ideal): Ca₂Al₃(SiO₄)(Si₂O₇)O(OH) • Group relation: epidote–clinozoisite–zoisite Mohs: ~6–6.5 • SG: ~3.1–3.4 • Luster: vitreous (pearly on cleavage) • Cleavage: perfect {010} Pleochroism: weak→medium...
Zoisitas
Zoisite • orthorhombic sorosilicate; clinozoisite polymorph Formula (ideal): Ca₂Al₃(SiO₄)(Si₂O₇)O(OH) • Group relation: epidote–clinozoisite–zoisite Mohs: ~6–6.5 • SG: ~3.1–3.4 • Luster: vitreous (pearly on cleavage) • Cleavage: perfect {010} Pleochroism: weak→medium...
Chalcedony
Chalcedony • microcrystalline quartz SiO2 (quartz + moganite) Mohs 6.5–7 • SG ~2.58–2.64 Chalcedony 🌥️ — silky light, ancient crafts, and a rainbow of varieties From Roman signet rings to...
Chalcedony
Chalcedony • microcrystalline quartz SiO2 (quartz + moganite) Mohs 6.5–7 • SG ~2.58–2.64 Chalcedony 🌥️ — silky light, ancient crafts, and a rainbow of varieties From Roman signet rings to...
Čaroitas
Charoite • rare, complex alkali–calcium chain silicate (hydrated) Crystal system: monoclinic • Habit: fibrous, radially growing, swirling "charoite" masses Mohs: ~5–6 • SG: ~2.6–2.8 • Luster: from vitreous to silky/pearly...
Čaroitas
Charoite • rare, complex alkali–calcium chain silicate (hydrated) Crystal system: monoclinic • Habit: fibrous, radially growing, swirling "charoite" masses Mohs: ~5–6 • SG: ~2.6–2.8 • Luster: from vitreous to silky/pearly...
Bronzitas
Orthopyroxene variety • Enstatite–ferrosilite series (Mg,Fe)SiO3 • The "bronze" glow of schiller Mohs ~5.5–6 • SG ~3.2–3.4 Bronzite 🟤✨ — earthy elegance with a metallic twinkle At first glance brown,...
Bronzitas
Orthopyroxene variety • Enstatite–ferrosilite series (Mg,Fe)SiO3 • The "bronze" glow of schiller Mohs ~5.5–6 • SG ~3.2–3.4 Bronzite 🟤✨ — earthy elegance with a metallic twinkle At first glance brown,...
Berilas
Beryl • cyclosilicate with six-membered rings — Be₃Al₂Si₆O₁₈ Crystal system: hexagonal • Habit: long hexagonal prisms; massive Mohs: ~7.5–8 • SG: ~2.63–2.90 • RI (local): ~1.57–1.60 • Double refraction: ~0.004–0.009...
Berilas
Beryl • cyclosilicate with six-membered rings — Be₃Al₂Si₆O₁₈ Crystal system: hexagonal • Habit: long hexagonal prisms; massive Mohs: ~7.5–8 • SG: ~2.63–2.90 • RI (local): ~1.57–1.60 • Double refraction: ~0.004–0.009...
Brachiopoda
Phylum Brachiopoda • “lamp shells” Marine • Filter feeders (lophophore) Cambrian–present Brachiopods 🐚—Paleozoic superstars with a calm modern life They look like bivalves but are not. Meet the elegant “lamp...
Brachiopoda
Phylum Brachiopoda • “lamp shells” Marine • Filter feeders (lophophore) Cambrian–present Brachiopods 🐚—Paleozoic superstars with a calm modern life They look like bivalves but are not. Meet the elegant “lamp...