Granite
Granite (Felsic Plutonic Rock)
igneous
Category
Man Made Composite
Browse man made composite specimens identified by the Rock Identifier community.
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Sandstone (Ferruginous)
Arenite (with Iron Oxide)
sedimentary
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Mother of Pearl (Nacre)
Calcium Carbonate (primarily aragonite, with conchiolin)
Organic Gemstone/Biomineral
Basalt
Basalt
Igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclasts
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Red Sandstone
Arenite (Fe2O3 rich)
sedimentary
Sandstone (with potential trace fossils)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Red Sandstone Pebble
Arenite with iron oxide (Hematite)
sedimentary
Vesicular Basalt
Basalt (extrusive volcanic rock)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (likely Quartzose)
Sandstone (Principally SiO2)
sedimentary
Granite
Felsic Intrusive Igneous Rock
igneous
Sandstone (with Iron Staining)
Clastic sedimentary rock (High Silica / Iron Oxide)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily composed of SiO2 - Silicon Dioxide)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (Quartz Sandstone)
sedimentary
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (SiO2 based with primary clasts 0.0625 to 2 mm)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (likely Graywacke or Lithic Sandstone)
Clastic Sedimentary Rock
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Vesicular Basalt
Basalt
igneous
Mixed Gemstone Beaded Jewelry
Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)
Mineral
Obsidian
Obsidian (volcanic glass, amorphous silica rich rock)
Igneous
Chert
Silicon dioxide (SiO2)
Sedimentary
Diamond
Native Carbon (C)
mineral
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Rhyolite
Rhyolite (High-silica volcanic rock)
igneous
Quartzite
Quartzite (SiO2 silicon dioxide)
metamorphic
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary