Kristalopedia
Granita
Granite • intrusive igneous rock Framework: quartz + feldspar (K-feldspar and plagioclase) + mica / amphibole Felsic • rich in silicon dioxide (~65–75% SiO₂) Texture: phaneritic (visible crystals) Granite —...
Granita
Granite • intrusive igneous rock Framework: quartz + feldspar (K-feldspar and plagioclase) + mica / amphibole Felsic • rich in silicon dioxide (~65–75% SiO₂) Texture: phaneritic (visible crystals) Granite —...
Red jasper
Red jasper • opaque microcrystalline quartz (chalcedony + moganite) Color: iron oxides (hematite/goethite) Mohs: ~6.5–7 • SG: ~2.58–2.64 • Luster: waxy to vitreous Texture: compact, fine-grained; polishes excellently Red jasper...
Red jasper
Red jasper • opaque microcrystalline quartz (chalcedony + moganite) Color: iron oxides (hematite/goethite) Mohs: ~6.5–7 • SG: ~2.58–2.64 • Luster: waxy to vitreous Texture: compact, fine-grained; polishes excellently Red jasper...
Ocean jasper
Ocean Jasper® / "oceanic jasper" • orbicular chalcedony (microcrystalline SiO₂) Rock context: silicified rhyolite in coastal outcrops Mohs ~6.5–7 • SG ~2.58–2.64 Textures: orbicules (target "eyes") • agate banding •...
Ocean jasper
Ocean Jasper® / "oceanic jasper" • orbicular chalcedony (microcrystalline SiO₂) Rock context: silicified rhyolite in coastal outcrops Mohs ~6.5–7 • SG ~2.58–2.64 Textures: orbicules (target "eyes") • agate banding •...
K2
K2 stone • granite with azurite (± malachite) spheres Base: quartz + feldspar (granite) Accents: azurite Cu3(CO3)2(OH)2 (blue) • malachite (green) Locality: Karakoram, Pakistan (named after the K2 summit) Composite...
K2
K2 stone • granite with azurite (± malachite) spheres Base: quartz + feldspar (granite) Accents: azurite Cu3(CO3)2(OH)2 (blue) • malachite (green) Locality: Karakoram, Pakistan (named after the K2 summit) Composite...
Fluorites
Fluorite • CaF2 Isometric (cubic) • Perfect octahedral cleavage Mohs 4 • Famous fluorescence Fluorite 🌈 — the rainbow mineral that gave its name to fluorescence Pastel green, royal purple,...
Fluorites
Fluorite • CaF2 Isometric (cubic) • Perfect octahedral cleavage Mohs 4 • Famous fluorescence Fluorite 🌈 — the rainbow mineral that gave its name to fluorescence Pastel green, royal purple,...
Smoky quartz
Fumed quartz • macrocrystalline SiO₂ Cause of color: radiation-created color centers (Al substitution + natural irradiation) Mohs ~7 • SG ~2.65 • RI ~1.544–1.553 • No cleavage • Trigonal Varieties:...
Smoky quartz
Fumed quartz • macrocrystalline SiO₂ Cause of color: radiation-created color centers (Al substitution + natural irradiation) Mohs ~7 • SG ~2.65 • RI ~1.544–1.553 • No cleavage • Trigonal Varieties:...