Sunstone
Oligoclase (a plagioclase feldspar variant), (Na,Ca)(Al,Si)4O8
mineral
Category
Organic Gemstone (Not A Mineral)
Browse organic gemstone (not a mineral) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Not A Mineral) in the encyclopedia
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Amethyst (Quartz Variety)
Amethyst (Silicon Dioxide - SiO2 with ferric iron impurities)
mineral
Amethyst (Chevron or Banded variety)
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Quartz (Silicon Dioxide) with Iron impurities, SiO2
mineral
Amethyst
Amethyst (Varietal of Quartz), SiO2 (Silicon Dioxide)
mineral
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Amethyst
Quartz variety; SiO2 (Silicon Dioxide)
Mineral
Chert (and Petrified Wood)
Silicon Dioxide (SiO2)
sedimentary
Almandine Garnet in Matrix
Almandine Garnet (Fe3Al2(SiO4)3) in Schist/Quartz Matrix
metamorphic
K2 Jasper (K2 Granite)
Azurite in Granite (Al2Cu3(CO3)2(OH)2 in NaAlSi3O8)
igneous
Chert (and Chert Breccia)
Silicon Dioxide (SiO2)
sedimentary
Quartz
Silicon dioxide (SiO2)
Mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Ocean Jasper (Orbicular Jasper)
Spherulitic Chalcedony (SiO2)
sedimentary
Mookaite Jasper
Silicified radiolarite (SiO2)
sedimentary
Epidote (Greenstone)
Calcium aluminum iron silicate hydroxide Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)
metamorphic
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Tiger's Eye (Unpolished)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Lake Superior Agate
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Mookaite Jasper
Radiolarite (Chert/Jasper variety), formula SiO2
sedimentary
Nuummite
Antophyllite-Gedrite Orthoamphibole (Mg,Fe)7Si8O22(OH)2
metamorphic
Granitic Pegmatite with Tourmaline
Granite (Feldspar/Quartz matrix) with Schorl (NaFe2+3Al6Si6O18(BO3)3(OH)3OH)
igneous
Turquoise (Dyed Howlite or Magnesite imitation)
Hydrated phosphate of copper and aluminum / CuAl6(PO4)4(OH)8·4H2O
mineral
Rutilated Quartz
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Emerald in Matrix (Quartz/Calcite)
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Clear Quartz
Silicon dioxide (SiO2)
mineral
Opal
Hydrated silica (SiO2·nH2O)
mineraloid
Shale
Fissile mudrock (composed primarily of clay minerals and quartz)
sedimentary
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
mineral
Black Marble with Quartz Veining
Metamorphosed Limestone (Recrystallized CaCO3)
metamorphic
Graphite
Graphite (Chemical Formula: C)
Mineral (Native Element)
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (varieties include Flint and Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (and Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and/or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and Flint variant)
Chert (SiO2)
sedimentary
Pickled Dragon Eggs (Fictional Interpretation: Purple Agate or Amethyst Geodes)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Chrysocolla
Chrysocolla; (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral