Crystals
Blue quartz
Blue variety of quartz SiO2 Trigonal crystal system Mohs 7 No true cleavage Color commonly produced by fine inclusions Dumortierite and amphibole-bearing material Crystals, massive quartz, quartzite, and polished forms...
Blue quartz
Blue variety of quartz SiO2 Trigonal crystal system Mohs 7 No true cleavage Color commonly produced by fine inclusions Dumortierite and amphibole-bearing material Crystals, massive quartz, quartzite, and polished forms...
Blue calcite
Blue variety of calcite CaCO3 Trigonal crystal system Mohs 3 Perfect rhombohedral cleavage Exceptionally strong double refraction Cloudy to translucent blue masses Banded calcite–aragonite material Blue Calcite: Soft Blue Color,...
Blue calcite
Blue variety of calcite CaCO3 Trigonal crystal system Mohs 3 Perfect rhombohedral cleavage Exceptionally strong double refraction Cloudy to translucent blue masses Banded calcite–aragonite material Blue Calcite: Soft Blue Color,...
Orange calcite
Calcium carbonate mineral CaCO3 Calcite group Trigonal crystal system Mohs 3 Perfect rhombohedral cleavage Very strong double refraction Variable orange-red luminescence Orange Calcite: Warm Light in a Classic Carbonate Orange...
Orange calcite
Calcium carbonate mineral CaCO3 Calcite group Trigonal crystal system Mohs 3 Perfect rhombohedral cleavage Very strong double refraction Variable orange-red luminescence Orange Calcite: Warm Light in a Classic Carbonate Orange...
Mahogany obsidian
Natural volcanic glass Amorphous silica-rich material Mohs approximately 5–5.5 Specific gravity approximately 2.3–2.45 Iron-red and brown flow pattern Smoky tea-brown edge translucency No cleavage; conchoidal fracture Brittle, with very sharp...
Mahogany obsidian
Natural volcanic glass Amorphous silica-rich material Mohs approximately 5–5.5 Specific gravity approximately 2.3–2.45 Iron-red and brown flow pattern Smoky tea-brown edge translucency No cleavage; conchoidal fracture Brittle, with very sharp...
Synthetic aventurine
Aventurine glass • manufactured decorative glass containing reflective crystalline inclusions Classic brown-gold form commonly called goldstone Metallic copper forms the traditional internal “stars” Deep-blue forms are often called blue goldstone...
Synthetic aventurine
Aventurine glass • manufactured decorative glass containing reflective crystalline inclusions Classic brown-gold form commonly called goldstone Metallic copper forms the traditional internal “stars” Deep-blue forms are often called blue goldstone...
Shiva lingam
River stone associated with the Narmada Known as Narmada lingam or bāṇaliṅga Naturally rounded, commonly further shaped and polished Cream, ochre, gray, rust, brown, and black patterns Iron-bearing minerals commonly...
Shiva lingam
River stone associated with the Narmada Known as Narmada lingam or bāṇaliṅga Naturally rounded, commonly further shaped and polished Cream, ochre, gray, rust, brown, and black patterns Iron-bearing minerals commonly...