Crystals
Kunzite
Kunzite • pink-to-violet gem variety of spodumene • LiAlSi2O6 Pyroxene group • monoclinic single-chain silicate Strong pleochroism • pale blush to saturated lilac by direction Perfect cleavage in two directions...
Kunzite
Kunzite • pink-to-violet gem variety of spodumene • LiAlSi2O6 Pyroxene group • monoclinic single-chain silicate Strong pleochroism • pale blush to saturated lilac by direction Perfect cleavage in two directions...
Iron tiger eye
Iron Tiger Eye • Tiger Iron • banded lapidary rock composed of chatoyant quartz, iron oxides, and red jasper Golden tiger-eye bands • aligned fibrous texture and moving reflected light...
Iron tiger eye
Iron Tiger Eye • Tiger Iron • banded lapidary rock composed of chatoyant quartz, iron oxides, and red jasper Golden tiger-eye bands • aligned fibrous texture and moving reflected light...
Feldspar
Feldspar group • framework silicates that dominate many igneous, metamorphic, and sedimentary rocks Major branches: alkali feldspar and plagioclase Principal endmembers: KAlSi3O8, NaAlSi3O8, and CaAl2Si2O8 Mohs 6–6.5 • two cleavages...
Feldspar
Feldspar group • framework silicates that dominate many igneous, metamorphic, and sedimentary rocks Major branches: alkali feldspar and plagioclase Principal endmembers: KAlSi3O8, NaAlSi3O8, and CaAl2Si2O8 Mohs 6–6.5 • two cleavages...
Dinosaur bone
Dinosaur bone • fossil vertebrate tissue preserved through mineral infilling, replacement, or both Body fossil rather than one mineral species Lapidary gembone is commonly silica-rich Iron and manganese create much...
Dinosaur bone
Dinosaur bone • fossil vertebrate tissue preserved through mineral infilling, replacement, or both Body fossil rather than one mineral species Lapidary gembone is commonly silica-rich Iron and manganese create much...
Celestine
Celestine • accepted mineral name; celestite remains a widely used synonym Composition: SrSO4 — strontium sulfate Orthorhombic • barite-group sulfate Mohs 3–3.5 • specific gravity about 3.95–3.97 Perfect basal cleavage...
Celestine
Celestine • accepted mineral name; celestite remains a widely used synonym Composition: SrSO4 — strontium sulfate Orthorhombic • barite-group sulfate Mohs 3–3.5 • specific gravity about 3.95–3.97 Perfect basal cleavage...
Brucite
Brucite • natural magnesium hydroxide • Mg(OH)2 Trigonal structure described in hexagonal axes Perfect basal cleavage • layered octahedral sheets Mohs 2.5–3 • specific gravity about 2.37–2.40 White, green, gray,...
Brucite
Brucite • natural magnesium hydroxide • Mg(OH)2 Trigonal structure described in hexagonal axes Perfect basal cleavage • layered octahedral sheets Mohs 2.5–3 • specific gravity about 2.37–2.40 White, green, gray,...