Crystals
Desert rose
Sulfate mineral rosette Gypsum or barite CaSO4·2H2O BaSO4 Sand-rich bladed crystals Desert Rose: Gypsum and Barite Rosettes Formed by Evaporation, Sand, and Time Desert rose is a descriptive name for...
Desert rose
Sulfate mineral rosette Gypsum or barite CaSO4·2H2O BaSO4 Sand-rich bladed crystals Desert Rose: Gypsum and Barite Rosettes Formed by Evaporation, Sand, and Time Desert rose is a descriptive name for...
Iceland spar
Transparent optical calcite Calcium carbonate, CaCO3 Trigonal crystal system Mohs hardness 3 Exceptionally strong birefringence Perfect rhombohedral cleavage Iceland Spar: Clear Calcite, Double Refraction, and the Geometry of Polarized Light...
Iceland spar
Transparent optical calcite Calcium carbonate, CaCO3 Trigonal crystal system Mohs hardness 3 Exceptionally strong birefringence Perfect rhombohedral cleavage Iceland Spar: Clear Calcite, Double Refraction, and the Geometry of Polarized Light...
Kambaba jasper
Trade-named orbicular volcanic rock Quartz and alkali feldspar groundmass Radial amphibole-rich aggregates Fine aegirine overgrowths and rims Composite hardness approximately 5–7 Commercially associated with Madagascar Kambaba Stone: Orbicular Volcanic Rock,...
Kambaba jasper
Trade-named orbicular volcanic rock Quartz and alkali feldspar groundmass Radial amphibole-rich aggregates Fine aegirine overgrowths and rims Composite hardness approximately 5–7 Commercially associated with Madagascar Kambaba Stone: Orbicular Volcanic Rock,...
Leopardite jasper
Trade-named spotted volcanic rock Commonly spherulitic or orbicular rhyolite Quartz and alkali-feldspar groundmass Dark oxide-rich rings and margins Composite hardness approximately 6–7 Opaque, polishable, and pattern-dependent Leopardite: Ringed Spherulites, Spotted...
Leopardite jasper
Trade-named spotted volcanic rock Commonly spherulitic or orbicular rhyolite Quartz and alkali-feldspar groundmass Dark oxide-rich rings and margins Composite hardness approximately 6–7 Opaque, polishable, and pattern-dependent Leopardite: Ringed Spherulites, Spotted...
Mookaite jasper
Locality-defined ornamental rock Silicified porcellanite in Windalia Radiolarite Late Early Cretaceous marine origin Dominant material: SiO2-rich aggregate Mohs approximately 6.5–7 in dense zones Cream, mustard, burgundy, plum, and mauve Mookaite:...
Mookaite jasper
Locality-defined ornamental rock Silicified porcellanite in Windalia Radiolarite Late Early Cretaceous marine origin Dominant material: SiO2-rich aggregate Mohs approximately 6.5–7 in dense zones Cream, mustard, burgundy, plum, and mauve Mookaite:...
Oceanic jasper
Locality-defined orbicular siliceous rock Spherulitic chalcedony and silicified volcanic host Quartz, chalcedony, agate, and drusy cavities Mohs approximately 6.5–7 Concentric orbs, halos, ribbons, and crystal pockets Marovato and Kabamby, Sofia...
Oceanic jasper
Locality-defined orbicular siliceous rock Spherulitic chalcedony and silicified volcanic host Quartz, chalcedony, agate, and drusy cavities Mohs approximately 6.5–7 Concentric orbs, halos, ribbons, and crystal pockets Marovato and Kabamby, Sofia...