Amethyst cluster
Amethyst, purple quartz (SiO₂)
mineral
Category
Mineral (Specifically A Gemstone Variety)
Browse mineral (specifically a gemstone variety) specimens identified by the Rock Identifier community.
Learn about Mineral (Specifically A Gemstone Variety) in the encyclopedia
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Montana Moss Agate
Chalcedony (SiO2) with Manganese/Iron oxide inclusions
sedimentary
Specular Hematite (Specularite)
Hematite (Iron(III) oxide) - Fe2O3
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Amazonite
K(AlSi3O8), Microcline (potassium feldspar)
mineral
Amazonite
Microcline (K(AlSi3O8))
mineral
Mookaite Jasper
Silicon Dioxide (SiO2) with various mineral inclusions
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Quartz (Herkimer Diamond variant)
Silicon Dioxide (SiO2)
mineral
Red Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)
mineral
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Granite (specifically Pink or Alkali Feldspar Granite)
Felsic Plutonic Rock (primarily SiO2 with KAlSi3O8)
igneous
Diopside (likely Chromian Diopside)
Diopside, part of Clinopyroxene family of inosilicates. Chemical formula: CaMgSi2O6. The green variety is often Chromian Diopside due to chromium impurities.
mineral
Pink Granite
Granite (Phaneritic Felsic Igneous Rock)
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
gemstone
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Flint Nodules)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Blue Sapphire (in a faceted jewelry setting)
Corundum (Al2O3) with trace Iron and Titanium
mineral
Jasper (specifically Polychrome or Desert Jasper)
Silicon Dioxide (SiO2) with iron oxide and other mineral impurities
sedimentary (chemical/biological origin)
Chert (Tripolitic Chert / Flint Nodules)
Microcrystalline Quartz (SiO2)
sedimentary
Polished orbicular granite (likely larvikite or rapakivi-type granite)
Granite; primarily quartz, potassium feldspar, plagioclase, and biotite/hornblende
igneous
Jasper (specifically Owyhee or Picture Jasper variety)
Jasper (Silicon Dioxide, SiO2)
sedimentary
Banded Agate (specifically Carnelian Agate color)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Green Jasper
Jasper (variety of Microcrystalline Quartz, SiO2)
sedimentary
Tree Agate (or Moss Agate), faceted into a crystal tower
Dendritic Agate (Silicon Dioxide, SiO2)
Mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Nodule fragment)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint Nodules)
Microcrystalline Quartz (SiO2)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Graywacke or Siltstone variety)
Clastic Sedimentary Rock (SiO2 with assorted mineral fragments)
sedimentary
Almandine Garnet
Almandine - Fe3Al2(SiO4)3
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Crazy Lace Agate
Chalcedony (SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with goethite or iron oxide inclusions
sedimentary
Mixed collection of minerals and rocks (Jasper, Carnelian, Granite, and Quartz)
Silicon Dioxide (SiO2) with varying impurities for silicates and igneous aggregates
igneous, sedimentary, and metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) - Variety: Chalcedony
mineral