Lapis Lazuli
Na8(Al6Si6O24)S2 (Lazurite is the primary constituent mineral)
metamorphic
Category
Metamorphic (Likely Gneiss Or Schist Based On Texture)
Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.
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Sandstone (likely with Borings or Vesicular Basalt)
Clastic Sedimentary Rock (Sandstone)
sedimentary
Weathered, iron-stained quartzite pebble
Quartzite; predominantly microcrystalline quartz (SiO₂) with iron-oxide staining
metamorphic
Tumbled purple quartzite
Quartzite; predominantly crystalline SiO₂ with minor iron-oxide or other mineral impurities
metamorphic
Sandstone (with Limonite/Iron Staining)
Arenite (SiO2 based) with FeO(OH) staining
sedimentary
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Pyritic Gneiss (with Garnet)
Gneiss containing Pyrite (FeS2) and Almandine Garnet (Fe3Al2(SiO4)3)
metamorphic
Aquamarine
Beryl (Be3Al2Si6O18)
Mineral
Blue Sapphire
Corundum (Al2O3 with trace Titanium and Iron)
mineral
Dalmatian Jasper
Peralkaline Quartz-Feldspar Igneous Rock with Arfvedsonite
igneous
Quartzite
Metamorphic Quartz (SiO2)
metamorphic
Peridotite
Peridotite (primarily Olivine and Pyroxene)
igneous
Dark mafic rock, likely basalt
Basalt; chiefly plagioclase feldspar, clinopyroxene, and commonly olivine or iron oxides
igneous
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Manhattan Schist
Manhattan Schist (Aluminous Metasedimentary Rock)
metamorphic
Garnet Schist
Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist
metamorphic
Quartzite Pebble (with iron staining)
Quartzite (SiO2 with ferric oxide impurities)
metamorphic
Pink Jade (Dyed Quartzite)
Silicon Dioxide (SiO2) - primarily Quartzite or Quartz
metamorphic
Rough Emerald
Beryl (Be3Al2Si6O18 with Chromium and Vanadium impurities)
mineral
Quartzite
SiO2 (Quartzite)
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Basalt
Basalt
igneous
Quartz-rich breccia or quartzite with iron-oxide veining
Microcrystalline to granular SiO₂ (quartz), with hematite/goethite and minor feldspar or mica
metamorphic
Weathered quartz-rich pebble (probable quartzite or quartz vein fragment)
Quartzite, predominantly silicon dioxide (SiO₂); exact identification is uncertain from the photograph
metamorphic
Quartz
Silicon Dioxide (SiO₂)
Mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Jasper (Green Jasper/River Stone)
Silicon Dioxide (SiO2) with impurities
sedimentary
Quartzite Cobble (Iron-stained)
Quartzite (SiO2)
metamorphic
Quartz (Granular Milky Quartz fragment)
Silicon Dioxide (SiO2)
mineral
Zoisite with Ruby
Anyolite (Ca2Al3(SiO4)3(OH) with Al2O3:Cr)
metamorphic
Slag (Industrial Glassy Byproduct)
Ferro-silicate Slag
Anthropogenic / Non-Natural
Basalt Pebble
Extrusive Igneous Rock
igneous
Basalt (with possible fluidal texture)
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Tourmaline-bearing pegmatite
Quartz–feldspar pegmatite with black schorl tourmaline; minor mica likely present
igneous
Unidentified gray rock/mineral specimen
Indeterminate; possibly quartz-rich rock or a metallic sulfide-bearing specimen
mineral
Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)
Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)
metamorphic
Quartzite Pebble (with Iron Inclusions)
Quartzite (primarily SiO2 with Fe2O3/FeOOH impurities)
metamorphic
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium and/or Vanadium impurities
mineral
River Stone / Siltstone
Siltstone (composed of lithified silt)
sedimentary