Quartz (possibly milky quartz)
Quartz (Silica; SiO₂)
Mineral
Category
Man Made Glass
Browse man made glass specimens identified by the Rock Identifier community.
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Yellow Quartzite Pebble
Quartzite (SiO2)
metamorphic
Chert Pebble (Jasperoid/Flint)
Silicon Dioxide (SiO2) - cryptocrystalline quartz
Sedimentary
Chert (Flint)
Chert (microcrystalline quartz)
sedimentary
Chert (or Flint)
Silicon dioxide (SiO2)
sedimentary
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral, often found as detrital grains in sedimentary rocks
Sandstone (likely Fossilized Wood or Concrete Simulacrum)
Arenite / Silicified Wood / Anthropogenic Concrete
sedimentary
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Native Silver
Silver (Ag)
mineral
Amethyst (Tumbled Cabinet Stone)
Silicon Dioxide (SiO2) with iron impurities
mineral
Chert (Chert Nodule)
Silicon Dioxide (SiO₂)
sedimentary
Chert (Green Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Gneiss
Gneiss (pronounced 'nice')
metamorphic
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Chert (variant Flint/Jasper)
Microcrystalline Opaline Silica (SiO2)
sedimentary
Chert (v. Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Brown Variety)
Microcrystalline Quartz (SiO2)
sedimentary
Mother of Pearl (Nacre)
Calcium Carbonate (primarily aragonite, with conchiolin)
Organic Gemstone/Biomineral
Chalcedony (River or Beach Pebbles)
Chalcedony (Silicon Dioxide, SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2)
mineral
Industrial Slag
Anthropogenic Vitreous Slag
igneous
Mixed Gemstone Beaded Jewelry
Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)
Mineral
Snowflake Obsidian
Volcanic glass with Spherulite inclusions (SiO2)
igneous
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Moonstone (specifically White Moonstone or Girasol Quartz)
Potassium aluminum silicate (KAlSi3O8)
mineral
Quartzite (Coldwater or Druzy Quartz over Quartzite)
SiO2 (Silicon Dioxide)
metamorphic
Chert (Arrowhead/Tool Grade)
Microcrystalline Quartz (SiO2)
sedimentary
Dyed Quartz (often sold as 'Blue Quartz' or 'Blue Agate')
Silicon Dioxide (SiO2) with artificial pigment
mineral
Chert (Gravel)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint) with Limestone Coating
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) cortex
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Chert (Gravel)
Chert (Cryptocrystalline silicon dioxide, SiO2)
sedimentary
Marble
Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.
Metamorphic Rock
Grey Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Seraphinite
Clinochlore (Mg,Fe)5Al(AlSi3O10)(OH)8 - specific variety for Seraphinite due to its fibrous inclusions and chatoyancy.
Mineral
Turquoise
Turquoise (Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O)
Mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 + Fe4+ impurities)
mineral
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions (SiO2)
igneous
Chert (Gravel Bit)
Microcrystalline silica (SiO2)
sedimentary
Stainless Steel Spoon
Iron-Chromium Alloy (Fe + Cr + Ni)
mineral-based human-made alloy