Crystals
Picasso jasper
Trade-named patterned carbonate stone More precisely Picasso Marble or Picasso Stone Fine-grained marble and limestone Dark manganese- and iron-bearing linework Carbonate matrix approximately Mohs 3–4 Classic association with southwestern Utah...
Picasso jasper
Trade-named patterned carbonate stone More precisely Picasso Marble or Picasso Stone Fine-grained marble and limestone Dark manganese- and iron-bearing linework Carbonate matrix approximately Mohs 3–4 Classic association with southwestern Utah...
Picture jasper
Descriptive category of scenic jasper Opaque microcrystalline silica-rich stone Layering, dendrites, veins, and oxide fronts Cream, blue-gray, tan, ochre, rust, and black Mohs approximately 6.5–7 Strong Pacific Northwest lapidary tradition...
Picture jasper
Descriptive category of scenic jasper Opaque microcrystalline silica-rich stone Layering, dendrites, veins, and oxide fronts Cream, blue-gray, tan, ochre, rust, and black Mohs approximately 6.5–7 Strong Pacific Northwest lapidary tradition...
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...