Quartzite (River Cobble)
Quartzite (mostly SiO2)
metamorphic
Category
Sedimentary (Processed Mineral Product)
Browse sedimentary (processed mineral product) specimens identified by the Rock Identifier community.
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Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)
mineral
Mixed Gemstone and Mineral Collection
Mixed Silica and Carbonate minerals (SiO2, CaSO4·2H2O, etc.)
mineral
Goldstone (Brown)
Aventurine Glass (Silicon Dioxide infused with Copper crystals)
mineraloid (man-made glass)
Pumice
Pumice (Vesicular volcanic glass)
igneous
Pumice
Pumicite / Vesicular Rhyolite
igneous
Pumice (Volcanic Rock)
Vesicular volcanic rock (composed largely of amorphous volcanic glass)
igneous
Pumice (or Volcanic Scoria)
Vesicular Rhyolite or Vesicular Basalt
igneous
Pumice
Pumice (a highly vesicular felsic volcanic rock)
igneous
Pumice
Pumice (a highly vesicular volcanic rock)
igneous
Pumice
Pumice (a vesicular volcanic glass)
igneous
Limonite (Iron Ore)
Hydrous Iron Oxide (goethite, lepidocrocite)
Mineral
Sea Glass
Amorphous Silica (Glass) SiO2
Mineraloid (Man-made origin)
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
Crushed Limestone
Calcium Carbonate (CaCO3)
Sedimentary
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Biotite (Black Mica)
K(Mg,Fe)3AlSi3O10(OH,F)2
mineral
Sandstone (with ripple marks)
Arenite / Quartz Sandstone
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Assorted Tumbled Gemstones
Mixed oxides and silicates (including Quartz, Chalcedony, and Feldspar variants)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace impurities of Titanium, Manganese, or Iron
mineral
Gabbro
Gabbro (mafic intrusive igneous rock)
igneous
Gabbro
Gabbro (Mg, Fe)2Si2O6 / CaAl2Si2O8
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Ferruginous Quartz
Quartz (Silicon Dioxide, SiO2) with iron oxide inclusions
mineral
Botryoidal Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Felsic intrusive igneous rock)
igneous
Quartz (Granular)
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Pumice (likely weathered/water-worn)
Vesicular volcanic glass
igneous
Pumice
Pumice (Amorphous volcanic glass)
igneous
Pumice
Pumice (Vesicular volcanic glass / Rhyolite or Trachyte)
igneous
Pumice
Vesicular volcanic glass
igneous
Pumice
Pumice (Vesicular volcanic glass)
igneous
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Tiger's Eye, Hematite, and Black Obsidian Bracelet
SiO2 (Tiger's Eye), Fe2O3 (Hematite), and 70-75% SiO2 (Obsidian)
mineral
Epidote (or Epidote-rich rock)
Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).
Mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks
Shale with Vein Infillings
Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.
Sedimentary Rock
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)
sedimentary