Chrysocolla Chalcedony
Hydrated Copper Phyllosilicate (Cu,Al)2H2Si2O5(OH)4 + SiO2
mineral
Category
Man Made Object (Coin)
Browse man made object (coin) specimens identified by the Rock Identifier community.
Shale with Siltstone layering
Sedimentary Clastic Rock (Mudstone/Shale)
sedimentary
Banded Iron Formation (BIF)
Banded Iron Formation (predominantly Hematite, Magnetite, and Chert/Quartz)
sedimentary
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Quartz Geode (partially formed)
Silicon Dioxide (SiO2)
mineral
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 oxides)
sedimentary
Chert (containing small fossils)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Ferruginous Sandstone (Ironstone)
Ferruginous Sandstone / Limonite-cemented Quartz Sandstone
sedimentary
Amber (Butterscotch/Egg Yolk Variety)
Succinite (Approx. C10H16O)
Organic Gemstone
N/A - Image does not contain a rock or mineral
Anthropogenic textile material
Non-geological
Quartzite
Quartzite (primarily composed of SiO O₂)
Sedimentary Rock
Chert (often referred to as 'Jasper' when red)
Chert (microcrystalline quartz, SiO₂)
Sedimentary rock
Clear Quartz (beads in a bracelet)
Quartz (SiO2)
Mineral
Serpentinite
Serpentinite (a rock composed predominantly of serpentine group minerals)
metamorphic
Milky Quartz (Gold-bearing Prospecting Specimen)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Bull Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Microcrystalline silica (SiO2)
sedimentary
Basalt
Basalt (High-iron/magnesium silicate rock)
igneous
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
White Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Yellow Quartzite
Quartzite (SiO2)
metamorphic
Ferruginous Sandstone (Gritstone)
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3 and FeO(OH))
sedimentary
Agate (Carnelian-Blue Agate mix)
Silicon Dioxide (SiO2)
mineral
Basalt with Caliche
Extrusive Mafic Igneous Rock with Secondary Carbonate Crust
igneous
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Lazulite
Lazulite (MgAl2(PO4)2(OH)2)
mineral
Glauconitic Sandstone (Greenstone)
Glauconitic Siliciclastic Sandstone (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Druzy Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Basalt
Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)
igneous
Amber
Succinite (specific to Baltic amber), fossilized tree resin
mineraloid
Slag (Industrial By-product)
Anthropogenic Vitreous Silica/Iron Silicate
mineral
Basalt
Basalt (SiO2 percentage between 45% and 52%)
igneous
Strawberry Quartz
Quartz (SiO2) with inclusions of Goethite or Hematite
Mineral
Chert / Greenstone
Silicon Dioxide (SiO2) with impurities
sedimentary
Selenite
Gypsum (CaSO4·2H2O), specifically the crystalline variety Selenite
Mineral
Sunstone (variety of Feldspar)
Oligoclase Sunstone, Plagioclase Feldspar (Na,Ca)Al(Si,Al)Si2O8
Mineral
River Rock (likely Quartzite or Chert)
Quartzite (primarily SiO2)
metamorphic
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Pink Granite (Water-worn Cobble)
Phaneritic Felsic Intrusive Igneous Rock
igneous
Porphyritic Rhyolite
Porphyritic Rhyolite
igneous
Sandstone (Pebble)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Caliche (with Lichen Cover)
Calcium carbonate-cemented soil layer (CaCO3)
sedimentary