Kristalopedia
Sunflowers
"Girasol" — an optical appearance, not a single species Most common: Girasol opal (SiO2·nH2O) and Girasol quartz (SiO2) Soft opaline glow • milky–bluish veil Girasol ✨ — a softly glowing...
Sunflowers
"Girasol" — an optical appearance, not a single species Most common: Girasol opal (SiO2·nH2O) and Girasol quartz (SiO2) Soft opaline glow • milky–bluish veil Girasol ✨ — a softly glowing...
Chalcopyrite
Chalcopyrite • CuFeS₂ — copper–iron sulfide Crystal system: tetragonal • Habit: disphenoids (pseudo-tetrahedrons), massive, granular Mohs: 3.5–4 • SG: ~4.1–4.3 • Streak: greenish black • Luster: metallic Appearance: brassy yellow,...
Chalcopyrite
Chalcopyrite • CuFeS₂ — copper–iron sulfide Crystal system: tetragonal • Habit: disphenoids (pseudo-tetrahedrons), massive, granular Mohs: 3.5–4 • SG: ~4.1–4.3 • Streak: greenish black • Luster: metallic Appearance: brassy yellow,...
Chrizantema
Chrysanthemum stone • "Flower stone" (菊花石) Not a separate mineral: white radial crystals (calcite, aragonite, or celestine) in a dark carbonate / shale matrix Typical age: late Paleozoic–Mesozoic (many famous...
Chrizantema
Chrysanthemum stone • "Flower stone" (菊花石) Not a separate mineral: white radial crystals (calcite, aragonite, or celestine) in a dark carbonate / shale matrix Typical age: late Paleozoic–Mesozoic (many famous...
Čiastolitas
Chiastolite • andalusite variety — Al₂SiO₅ Crystal system: orthorhombic • Form: prismatic crystals in shales and hornfels Distinguishing feature: carbonaceous inclusions in cross-section form a cross ("Maltese cross") Mohs scale:...
Čiastolitas
Chiastolite • andalusite variety — Al₂SiO₅ Crystal system: orthorhombic • Form: prismatic crystals in shales and hornfels Distinguishing feature: carbonaceous inclusions in cross-section form a cross ("Maltese cross") Mohs scale:...
Bismuths
Element 83 • Bi Rhombohedral • "hopper" crystal habit (synthetic) Melting point ~271.5 °C Bismuth 🌈 — iridescent geometry, a "friendly" heavy metal The rainbow "stairs" you see online? That's bismuth,...
Bismuths
Element 83 • Bi Rhombohedral • "hopper" crystal habit (synthetic) Melting point ~271.5 °C Bismuth 🌈 — iridescent geometry, a "friendly" heavy metal The rainbow "stairs" you see online? That's bismuth,...
Ammonites
Fossil cephalopod (extinct) Devonian–Cretaceous • ~409–66 million years ago Shell: aragonite → often replaced by calcite/pyrite/silicon dioxide Ammonite 🐚 — Spirals of deep time: from fossil shelves to gemstone play...
Ammonites
Fossil cephalopod (extinct) Devonian–Cretaceous • ~409–66 million years ago Shell: aragonite → often replaced by calcite/pyrite/silicon dioxide Ammonite 🐚 — Spirals of deep time: from fossil shelves to gemstone play...