Chert (River Siltstone/Flint)
Chert (SiO2)
sedimentary
Category
Organic Gemstone (Not A Mineral)
Browse organic gemstone (not a mineral) specimens identified by the Rock Identifier community.
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Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
sedimentary
Chert (Green variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Nuummite
Nuummite (intergrowth of orthoamphiboles Anthophyllite and Gedrite, (Mg,Fe)7Si8O22(OH)2)
metamorphic
Petrified Wood
Silicified Wood (SiO2-dominant)
fossil
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Green Quartz (Prasiolite)
Silicon Dioxide (SiO2) with trace impurities
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pallasite Meteorite
Pallasite (ST-class)
mineral
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Peridot
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon dioxide (SiO2)
mineral
Orange Quartz (Tangerine Quartz)
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Diamond (or Cubic Zirconia simulant)
Carbon (C) or Zirconium Dioxide (ZrO2)
mineral
Amazonite
Microcline (KAlSi3O8) with lead impurities
mineral
Quartz with Mica inclusions (Pegmatite)
Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions
igneous
Chert (or Flint)
Chert (Sedimentary Cryptocrystalline Sio2)
sedimentary
Chert (Jasper-bearing)
Microcrystalline silica (SiO2) with iron oxide inclusions
sedimentary
Amazonite
Microcline (K(AlSi3O8))
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Amethyst Geode
Silicon Dioxide (SiO2) - Amethyst variety of Quartz
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sunstone
(Ca,Na)((Al,Si)2Si2)O8 (Plagioclase Feldspar)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Peridot
Olivine (Mg, Fe)2SiO4
mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Amethyst
Silicon Dioxide (SiO2) with trace Iron (Fe)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (often referred to as Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Chert / Flint)
Silicon Dioxide (SiO2)
sedimentary
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Red Jasper
SiO2 (Silicon Dioxide with Iron Oxide impurities)
sedimentary
Garnet (Almandine)
Almandine, Fe3Al2(SiO4)3
metamorphic
Basalt with Peridotite Xenolith
Mafic Igneous Rock with Peridotite Inclusion (Olivine-rich)
igneous