Quartzite Pebble
Metamorphic Quartz (SiO2)
metamorphic
Category
Mineralogical Specimen
Browse mineralogical specimen specimens identified by the Rock Identifier community.
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Chalcedony (Agate/Chert)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Soapstone mushroom decorative carving
Steatite (Hydrous magnesium silicate, Mg3Si4O10(OH)2)
metamorphic
Chert (Jasper/River Rock)
Microcrystalline Quartz (SiO2)
sedimentary
Weathered granite or granitic pegmatite cobble
Granite/granitic rock, composed mainly of quartz (SiO₂), feldspar, and minor biotite or other dark minerals; the reddish-brown areas may be iron-oxide staining or weathered accessory minerals
igneous
Vesicular Basalt (Scoria)
Aphanitic Mafic Igneous Rock (Vesicular Basalt)
igneous
Tumbled black stone, likely basalt or black jasper
Probably basalt (fine-grained plagioclase–pyroxene rock); exact identification is uncertain from the image
igneous
Limonite or Ironstone Concretion
FeO(OH)·nH₂O (Hydrated iron oxide-hydroxide)
mineral
Blue Lace Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Mixed river-worn rock and mineral collection
Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble
igneous, sedimentary, metamorphic, mineral
Yellow Quartzite
Quartzite (SiO2)
metamorphic
Unakite
Epidotized Granite
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Black Obsidian (Faceted)
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Diamond (Heart Cut)
Carbon (C)
gemstone
Quartz-Veined Basalt River Stone
Basalt with milky quartz (SiO2) vein
igneous
Quartzite Pebble
Metamorphosed Quartz (SiO2)
metamorphic
Red Sandstone
Arenite with Hematite (Fe2O3)
sedimentary
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Sandstone (Quartzite-rich)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Agate (Fortification Agate)
Banded Chalcedony (SiO2)
mineral
White Jade / Jadeite
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Basalt
Aphanitic Mafic Igneous Rock
igneous
Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
sedimentary
Sandstone (Greywacke/Siltstone variant)
Arenite / Wacke (SiO2 with diverse mineral inclusions)
sedimentary
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Pink Quartz (Rose Quartz variant)
Silicon Dioxide (SiO2)
mineral
Red Cubic Zirconia (Simulated Garnet)
Zirconium Dioxide (ZrO2)
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Green beryl (likely aquamarine-grade beryl)
Beryl, Be₃Al₂Si₆O₁₈; blue-green color is caused mainly by iron
mineral
Milky quartz (likely quartzite or massive quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Clear quartz crystal
Quartz (silicon dioxide, SiO₂)
mineral
Basalt (with Brass Inlay)
Basalt (Mafic volcanic rock)
igneous
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium fluoride (CaF2)
mineral
Druzy Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Blue Apatite
Apatite, Ca5(PO4)3(F,Cl,OH)
mineral
Dyed Agate
Agate (SiO2)
Mineral
Quartzite with inclusions or a banded chert
Quartzite or Chert
Metamorphic or Sedimentary