Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Category
Mineral Like (Natural Glass)
Browse mineral like (natural glass) specimens identified by the Rock Identifier community.
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Amethyst
Silicon Dioxide (SiO2) with trace Iron (Fe) impurities
mineral
Riverstone Quartzite (Water-worn Siltstone/Quartzite)
Metamorphosed Quartz-rich Arenite (SiO2)
metamorphic
Hag Stone
Perforated Sedimentary Rock (typically Flint, Chert, or Limestone)
sedimentary
Coquina (Hag Stone variant)
Biocalcarenite (Coquina)
sedimentary
Black Obsidian
Obsidian (Volcanic Glass)
igneous
Tumbled blue chalcedony (likely common blue quartz)
Microcrystalline quartz, SiO₂; chalcedony variety
mineral
Diamond
Diamond (pure carbon; C)
Mineral
Turquoise (Dyed Howlite or Magnesite imitation)
Hydrated phosphate of copper and aluminum / CuAl6(PO4)4(OH)8·4H2O
mineral
Pink Feldspar (Orthoclase)
Orthoclase Feldspar (KAlSi3O8)
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Green glassy cabochon, likely dyed or synthetic material
Uncertain; possibly green obsidian, chrysoprase, or synthetic glass
gemstone
Shale (or Mudstone)
Laminose Mudrock (composition: clay minerals, quartz, and mica flakes)
sedimentary
Blue Agate (Dyed Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz Vein / Quartz Matrix
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Magnetite
Magnetite (Fe3O4)
Mineral
Diorite (Spotted or Dalmatian Stone effect)
Diorite (Intermediate Plutonic Rock)
igneous
Agate (Geode/Nodule)
Chalcedony (cryptocrystalline silica, SiO2)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Jewelry Chain with Blue and Clear Gemstones (Likely Cubic Zirconia)
Cubic Zirconia (ZrO₂), Silver or White Gold/Platinum Alloy
Mineral (synthetic) and Metal (precious/base)
Citrine Quartz
Silicon Dioxide (SiO2) - Ferric Iron impurities
mineral
Carnelian Agate
SiO2 (Silicon Dioxide - Chalcedony variant)
gemstone
Corundum (Ruby/Sapphire crystal)
Al2O3 (Aluminum Oxide)
mineral
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Amethyst Geode (Carved)
Amethyst (Violet Crystalline Quartz - SiO2)
mineral
Blue Dyed Agate
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Quartz (specifically Milky or Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Raw gold nugget or gold-bearing quartz
Native gold (Au), possibly with quartz (SiO₂) and iron-oxide staining
mineral
Magnetic Hematite
Magnetized Hematite (an iron oxide mineral, Fe2O3, that has undergone magnetization)
Mineral
Golden Healer Quartz
Ferruginous Quartz (SiO2 with Fe2O3 inclusions)
mineral
Black Obsidian
Amorphous volcanic glass (SiO2 + impurities)
igneous
Howlite
Howlite (Calcium borosilicate hydroxide, Ca2B5SiO9(OH)5)
mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
Mineral
Emerald (Rough)
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Natural Pearl
Calcium carbonate (primarily Aragonite and Conchiolin), CaCO3
mineral
Quartz Druze (on Matrix)
Silicon Dioxide (SiO2)
mineral
Potassium Feldspar (Orthoclase / Microcline)
KAlSi3O8
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral