Tumbled Quartz (Snow Quartz)
Silicon Dioxide (SiO2)
mineral
Category
Mineral, Specifically A Detrital Grain
Browse mineral, specifically a detrital grain specimens identified by the Rock Identifier community.
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Amazonite
K(AlSi3O8) - Microcline (Var. Amazonite)
mineral
Shungite
Shungite (carbon-rich Precambrian mineraloid)
mineral
Agate
SiO2
Mineral
Quartz (Float/Abraded)
Quartz (SiO₂)
Mineral
Quartzite Pebbles
Metamorphosed sandstone (SiO2)
metamorphic
Moonstone
Orthoclase and Albite (KAlSi3O8 / NaAlSi3O8)
mineral
Small weathered rock fragment, possibly quartz-rich
Unidentified lithic fragment; species cannot be determined from the image
igneous
Astrophyllite in matrix
(K,Na)3(Fe,Mn)7Ti2Si8O24(O,OH)7
mineral
Amethyst
SiO2 (Silicon Dioxide with iron impurities)
mineral
Rose Quartz
Silicon dioxide (SiO2) with traces of titanium, iron, or manganese
mineral
Green Aventurine
Quartz with Fuchsite inclusions (SiO2)
mineral
Rainbow Moonstone
White Labradorite (formula: (Na,Ca)(Al,Si)4O8)
mineral
Bumblebee Jasper
Fibrous Calcite and Quartz with Volcanic Matter (CaCO3 / SiO2)
mineral
Rhodolite Garnet
Mg3Al2(SiO4)3 - Fe3Al2(SiO4)3 (Pyrope-Almandine series)
mineral
Native gold (small nugget or grain)
Native gold, Au
mineral
Coprolite
Coprolite (fossilized feces)
fossil
Polished/tumbled brown-and-white jasper
Microcrystalline quartz (SiO₂), commonly called jasper; likely brecciated or banded jasper
sedimentary
Obsidian Fetish Carving with Turquoise Inlay
Volcanic Glass with Turquoise (CuAl6(PO4)4(OH)8·4H2O)
igneous
Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Puddingstone
Conglomerate (specifically a type of jasper conglomerate or quartz conglomerate)
Sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Hag Stone
Perforated Sedimentary Rock / Flint / Limestone
sedimentary
Basalt with Vesicular Texture
Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Carnelian (a variety of Chalcedony)
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Muscovite Mica
Muscovite / KAl2(AlSi3O10)(OH)2
mineral
Black Opal
Hydrated Amorphous Silica (SiO2 "n" H2O)
gemstone
Tiny amber-colored crystal or mineral fragment
Indeterminate from image; possibly quartz, citrine, topaz, or iron-stained feldspar
mineral
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Waterworn pebble, possibly iron-rich basalt or river stone
Unidentified lithic clast; composition cannot be determined reliably from the image
igneous
Red Jasper
Microcrystalline Quartz (SiO2) with iron oxide inclusions
sedimentary
Limestone (specifically Grainstone or Micrite)
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 principal composition)
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Red Jasper (with Quartz)
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Citrine
Citrine (Silicon Dioxide, SiO2)
mineral
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Amazonite
Amazonite (KAlSi3O8 - Microcline)
mineral
Baroque Pearl
Biogenic Calcium Carbonate (Aragonite/Conchiolin)
mineral