Crystals
Bronzite
Orthopyroxene variety (Mg,Fe)SiO3 Orthorhombic Mohs approximately 5.5–6 Directional bronze schiller Two cleavages near 90° Specific gravity approximately 3.2–3.4 Bronzite: Orthopyroxene, Bronze Schiller, and Directional Light Bronzite is a traditional variety...
Bronzite
Orthopyroxene variety (Mg,Fe)SiO3 Orthorhombic Mohs approximately 5.5–6 Directional bronze schiller Two cleavages near 90° Specific gravity approximately 3.2–3.4 Bronzite: Orthopyroxene, Bronze Schiller, and Directional Light Bronzite is a traditional variety...
Chrysoprase
Nickel-colored chalcedony Microcrystalline SiO2 Ni2+ and nickel-silicate color Mohs approximately 6.5–7 Translucent apple to jade green Laterite and ultramafic settings Waxy to vitreous polish Chrysoprase: Apple-Green Chalcedony Shaped by Nickel,...
Chrysoprase
Nickel-colored chalcedony Microcrystalline SiO2 Ni2+ and nickel-silicate color Mohs approximately 6.5–7 Translucent apple to jade green Laterite and ultramafic settings Waxy to vitreous polish Chrysoprase: Apple-Green Chalcedony Shaped by Nickel,...
Chalcedony
Microcrystalline silica SiO2 Quartz with moganite Mohs approximately 6.5–7 No cleavage Waxy to vitreous luster Translucent to opaque Chalcedony: Mist-Lit Quartz, Ancient Carving Stone, and a Family of Many Forms...
Chalcedony
Microcrystalline silica SiO2 Quartz with moganite Mohs approximately 6.5–7 No cleavage Waxy to vitreous luster Translucent to opaque Chalcedony: Mist-Lit Quartz, Ancient Carving Stone, and a Family of Many Forms...
Diopside
Clinopyroxene mineral CaMgSi2O6 Monoclinic crystal system Mohs approximately 5.5–6.5 Two cleavages near 90 degrees Chrome-green gem variety Four-ray star variety Violet violane variety Diopside: Chrome-Green Pyroxene, Alpine Marble, and Four-Ray...
Diopside
Clinopyroxene mineral CaMgSi2O6 Monoclinic crystal system Mohs approximately 5.5–6.5 Two cleavages near 90 degrees Chrome-green gem variety Four-ray star variety Violet violane variety Diopside: Chrome-Green Pyroxene, Alpine Marble, and Four-Ray...
Carnelian
Chalcedony variety SiO2 Microcrystalline quartz Mohs approximately 6.5–7 Iron-colored orange to red Translucent internal glow No cleavage Carnelian: Iron-Colored Chalcedony, Translucent Ember Light, and the Art of the Seal Carnelian...
Carnelian
Chalcedony variety SiO2 Microcrystalline quartz Mohs approximately 6.5–7 Iron-colored orange to red Translucent internal glow No cleavage Carnelian: Iron-Colored Chalcedony, Translucent Ember Light, and the Art of the Seal Carnelian...
Hematite
Iron(III) oxide Fe2O3 Trigonal crystal system Mohs approximately 5–6.5 Specific gravity approximately 5.0–5.3 Red to red-brown streak Metallic to earthy luster Major iron ore and historic pigment mineral Hematite: The...
Hematite
Iron(III) oxide Fe2O3 Trigonal crystal system Mohs approximately 5–6.5 Specific gravity approximately 5.0–5.3 Red to red-brown streak Metallic to earthy luster Major iron ore and historic pigment mineral Hematite: The...