Man-made Synthetic Material (Costume Faux Fur)
Synthetic Polymer (Polyester/Acrylic)
not a rock
Category
Mineral, Part Of A Rock
Browse mineral, part of a rock specimens identified by the Rock Identifier community.
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Sandstone or Mudstone with Iron Staining
Ferruginous Sandstone/Mudstone
Sedimentary
Diamond
Diamond (pure carbon; C)
Mineral
Malaysian 50 Sen Coin
Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)
Man-made object (coin)
Tumbled white quartz pebble
Quartz (silicon dioxide, SiO₂), possibly milky quartz
mineral
Small polished pink-and-white mineral pebble
Likely rose quartz or pale pink quartz; exact identification is uncertain from the image
mineral
Granite Pebble
Granite
igneous
Amethyst (as part of a multi-stone bracelet)
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Tumbled limestone pebble
Limestone, primarily calcite (CaCO₃)
sedimentary
Unknown Rock Fragment
Unknown
unknown
Bivalve Shell (Fossil or Contemporary)
Class Bivalvie (various genera and species of clams, cockles, etc.)
Sedimentary (Biogenic sediment or biological remain)
Moonstone
Orthoclase Feldspar (KAlSi3O8)
Mineral
Laterite
Laterite (no specific mineral formula as it's a rock type)
Sedimentary
Rutilated Quartz (beads)
SiO2 with TiO2 inclusions (Titanium Dioxide inclusions within Quartz)
Mineral
Pebble
Clast (specifically a granule or small pebble)
Sedimentary
Copper Ore / Altered Granodiorite
Cupriferous rock with silicate gangue
mineral
Basalt with Quartz Vein
Mafic volcanic rock with hydrothermal SiO2 filling
igneous
Banded Iron Formation (Fragment)
Banded Iron Formation (BIF)
sedimentary
Rock Specimen
Unclassified rock specimen
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Chalcedony Geode Part (Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Carved Mottled Greenish-Yellow Crystal/Glass Object
Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.
Man-made Object/Uncertain Mineral
Red Sandstone
Arenite (primarily quartz with iron oxide cement)
sedimentary
Schist (likely Mica Schist)
Mica Schist
metamorphic
Basalt with Xenolith
Extrusive Igneous Rock containing Mantle Xenolith
igneous
Xenolith in Basalt
Mafic Igneous Rock with Felsic Inclusion
igneous
Weathered porphyritic basalt
Basalt, likely plagioclase-phyric basalt; primarily a fine-grained aggregate of plagioclase feldspar, clinopyroxene, and possibly olivine or iron-titanium oxides
igneous
Red Sandstone
Clastic Sandstone (typically Quartz-rich with Iron Oxide)
sedimentary
River Rock / Stream Pebble
Fluvial Clast / Rounded Sedimentary Particle
Sedimentary Rock (possibly composed of various minerals)
Gravel / Crushed Stone
Aggregate (mixed mineral rock fragments)
sedimentary
Note on Image Identification: Textile
N/A (Anthropogenic material)
not a rock
Geode
Quartz nodule / Chalcedony-lined cavity
sedimentary
Druzy Quartz on Limestone
Silicon Dioxide (SiO2) on Calcium Carbonate (CaCO3)
sedimentary
Crushed Granite and Basalt
Phaneritic Igneous Rock / Aphanitic Igneous Rock
igneous
Pumice
Pumice (volcanic rock)
Igneous
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Sandstone
Arenite
sedimentary
Geode (Quartz / Chalcedony Geode)
SiO2 (Silicon Dioxide)
sedimentary
Mixed Rock and Mineral Collection
Various geological specimens
igneous, sedimentary, and metamorphic
Druzy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Quartz with Sericite and Cinnabar
Silicon Dioxide (SiO2) with muscovite/sericite and mercury sulfide (HgS)
mineral