Amethyst (Raw Cluster)
Silicon Dioxide with iron impurities (SiO2)
mineral
Category
Organic Gem Material (Botanical)
Browse organic gem material (botanical) specimens identified by the Rock Identifier community.
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Red Jasper
Chalcedony (SiO2) with iron inclusions
sedimentary
Smoky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Basalt with Olivine inclusion
Mafic Volcanic Basalt (Fe,Mg)2SiO4
igneous
Pallasite Meteorite
Pallasite (Iron-Nickel Matrix with Olivine/Peridot inclusions)
Mineral / Extraterrestrial Rock
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Smoky Quartz with Feldspar
Quartz (SiO2) with Potassium Feldspar (KAlSi3O8)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
SiO2 (Silicon Dioxide with aluminum impurities)
mineral
Pallasite Meteorite (likely Imilac or Brenham)
Stony-Iron Meteorite (Pallasite)
mineral
Peridot
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
Smoky Quartz on Matrix
Crystalline Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Moonstone
Orthoclase feldspar ((K,Na)AlSi3O8)
mineral
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide impurities, SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) - Opaque Chalcedony
sedimentary
Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Chrysocolla on Matrix
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Baroque Pearl (and potentially a small Sapphire/Blue Topaz)
Pearl: Calcium Carbonate (aragonite or calcite) with conchiolin. Sapphire: Aluminum Oxide (Al2O3). Blue Topaz: Al2SiO4(F,OH)2.
Organic Gemstone (for pearl), Mineral (for sapphire/topaz)
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Black Chert
Chert (microcrystalline quartz)
Mineral
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (and Jasper blend)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Smoky Quartz occurring with Feldspar
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Anthracite Coal
Anthracite
metamorphic
Diamond
Diamond (pure carbon, C)
Mineral
Dyed Agate / Painted Stone
Silicon Dioxide (SiO2) with artificial pigment
sedimentary (base), then artificial
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Rough Gemstone Grains (Mixed Sapphires and Quartz)
Corundum (Al2O3) and Quartz (SiO2)
mineral
Blue Anhydrite
Anhydrite (CaSO4)
mineral
Milky and Smoky Quartz Cobble
Silicon Dioxide (SiO2)
mineral
Basalt with Olivine Phenocrysts
Porphyritic Basalt (with (Mg, Fe)2SiO4)
igneous
Chert (Flint variety)
Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2
sedimentary
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Corundum (Ruby Variety)
Corundum (Al2O3)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Dyed Tumbled Quartz
Silicon Dioxide (SiO2) with artificial pigment
mineral