Serpentine (variety: Serpentine Rock)
Antigorite, Lizardite, or Chrysotile; formula generally (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Category
Organic Gemstone
Browse organic gemstone specimens identified by the Rock Identifier community.
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate) - (Mn+2,Fe+2,Mg,Ca)SiO3
mineral
Aquamarine with Ruby Accent
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Aluminum Oxide (Al2O3)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Rhodonite
Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3
mineral
Chert (Jasper variety)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Rhodonite
(Mn,Fe,Mg,Ca)SiO3
mineral
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Connemara Marble
Ophiocalcite (Serpentinitic Marble)
metamorphic
Shale
Shale
sedimentary
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) within Basalt (Rock)
igneous
Carnelian Agate
Chalcedony (SiO2) with iron oxide inclusions
mineral
Kunzite (Pink Spodumene)
Spodumene, LiAl(SiO3)2
mineral
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Jadeite Jade
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Rough Gemstone Grains (Mixed Sapphires and Quartz)
Corundum (Al2O3) and Quartz (SiO2)
mineral
Garnet (Almandine)
Almandine, Fe3Al2(SiO4)3
metamorphic
Quartz (Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Nuummite
Nuummite (mixture of Anthophyllite and Gedrite)
metamorphic
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Banded Agate
Cryptocrystalline Silicon Dioxide (SiO2)
mineral
Dalmatian Stone
Dalmatian Jasper (Aplitic Rock)
igneous
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Yellow Quartz or Citrine
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxides)
metamorphic
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Amazonite
Amazonite (Microcline) - K(AlSi3O8)
mineral
Labradorite (Carved)
(Ca, Na)(Al, Si)4O8
mineral
Tektite (Indochinite)
Tektite (High-silica natural glass)
mineraloid / impact glass
Amethyst
Amethyst (Silicon Dioxide - SiO2 with impurities of iron)
mineral
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8)
mineral