Chert
Chert (microcrystalline quartz)
sedimentary
Category
Mineral (Man Made Glass)
Browse mineral (man made glass) specimens identified by the Rock Identifier community.
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Chert
Microcrystalline Quartz (SiO2)
sedimentary
Crinoid Stem Segment Fossil
Crinoidea (columnal ossicle)
fossil
Chert (Jasper type)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Diamond Plate (Steel)
Alloyed Carbon Steel or Aluminum with 'Durbar' pattern
not a rock (Man-made industrial metal)
Asphalt Chunk (with aggregate)
Bituminous concrete / Anthropogenic conglomerate
sedimentary (anthropogenic/man-made conglomerate)
Hag Stone (Flint with natural hole)
Silicon Dioxide (SiO2) - Nodular Chert / Flint
sedimentary
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Clay (as a rock-forming material)
Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)
Mineral
Chert (or Flint)
Chert (cryptocrystalline quartz), SiO2
Sedimentary
Chert (Brown Variety)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Coral (Petoskey-style)
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Diorite (River Pebble)
Intermediate plutonic igneous rock
igneous
Yellow Chert (Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled Gabbro
Gabbro (Mafic intrusive igneous rock)
igneous
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Bored Limestone
Limestone with Ichnofossils (Gastrochaenolites or Entobia)
sedimentary
Chert (Iron-stained)
Chert (Microcrystalline and Cryptocrystalline Quartz, SiO2)
sedimentary
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Crinoid Fossil Stem Segment
Class Crinoidea (Echinodermata)
sedimentary
Ferrous Slag (Iron Smelting By-product)
Fused Siliceous Slag
Anthropogenic Material (Man-made Rock)
Ferrochrome Slag
Industrial Glassy Slag (Fe-Cr alloy byproduct)
Antropogenic (Man-made industrial byproduct)
Synthetic Costume Glove (Paws)
Polyethylene terephthalate (Polyester) & Polyurethane blend
Non-geological / Man-made textile
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(F,OH)2)
mineral
BROWN GRANITE (likely 'Tan Brown' or similar)
Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)
igneous
Flint
Silicon Dioxide (SiO2) - Microcrystalline Quartz / Chert
sedimentary
White Marble
Recrystallized Calcite Rock (CaCO3)
metamorphic
Dolerite (Diabase)
Dolerite / Diabase
igneous
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')
Calcite (Calcium Carbonate, CaCO3)
Sedimentary
Rose Quartz (likely carved)
Rose Quartz (SiO2)
Mineral
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
White Jade (Nephrite)
Nephrite, Ca2(Mg,Fe)5Si8O22(OH)2
Mineral
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Chert / Yellow Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert with Limestone
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) Matrix
sedimentary
Chert (specifically White Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Marble
Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)
metamorphic
Hoodoo (Limestone / Siltstone Formation)
Claron Formation (Sedimentary Rock - Limestone, Mudstone, Dolomite)
sedimentary