Herkimer Diamond (Quartz Crystal)
Silicon Dioxide (SiO2)
mineral
Category
Not A Natural Rock
Browse not a natural rock specimens identified by the Rock Identifier community.
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Small tan mineral or rock fragment (unidentified)
Indeterminate from the image; no diagnostic features are visible
mineral
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial purple dye
mineral
Dark gray pebble, possibly slate or fine-grained basalt
Unidentified fine-grained rock; visual identification is insufficient to distinguish slate from basalt
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
Red coral beads
Precious coral, commonly Corallium rubrum (calcium-carbonate skeleton)
gemstone
Opalite
Synthetically produced glass (Silicon Dioxide with metallic inclusions)
Mineraloid (Man-made Glass)
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Painted Rock
Rock coated with synthetic acrylic paint
sedimentary
Granite Pebble
Phaneritic intrusive igneous rock
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Limonite (Ironstone)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Generic Rock Fragment
Rock Fragment
sedimentary
Generic Rock / Pebble
Undetermined rock specimen
sedimentary
Granite
Granite
igneous
Dyed or synthetic turquoise-blue glass-like specimen
Likely man-made colored glass or resin; exact identification requires testing
mineral
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Conglomeratic sandstone or breccia
Lithic arkose / polymictic conglomeratic sandstone
sedimentary
Yellow Quartz (Citrine Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Mossy Rock
Mixed lithology rock with Bryophyta (moss)
sedimentary
Concrete / Conglomerate (Man-made)
Artificial Conglomerate (Cementitious Composite)
sedimentary
Conglomerate
Clastic Sedimentary Rock
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary
Frosted Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Vesicular Basalt
Extrusive mafic igneous rock
igneous
Chert with Asphaltum (or Tar)
Silica (SiO2) with natural Bitumen/Asphaltum
sedimentary
Basalt Pebble
Extrusive Igneous Rock
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Agate (Water-Worn)
Cryptocrystalline quartz (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Granite Pebble
Intrusive Igneous Rock
igneous
Basalt Pebble
Extrusive Igneous Rock
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Kimberlite
Ultramafic igneous rock
igneous
Rounded gray pebble, likely granite or a similar crystalline rock
Undetermined; possibly granitic rock composed mainly of quartz, feldspar, and dark mica
igneous
Green sea glass or green glass-like tumbled material
Amorphous silicate glass; likely anthropogenic soda-lime glass, not a natural mineral
mineral
Mystic Topaz
Coated Al2SiO4(F,OH)2
gemstone