Rainbow Hematite (Man-made/Treated)
Tumbled Hematite with Titanium/Anodized coating (Iron(III) oxide, Fe2O3)
mineral
Category
Igneous Or Sedimentary (Water Worn)
Browse igneous or sedimentary (water worn) specimens identified by the Rock Identifier community.
Rainbow Obsidian
Volcanic Glass (SiO2 + impurities)
Igneous
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral
Polished Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Fossilized Favosites (Honeycomb Coral)
Favosites (Genus), Phylum Cnidaria, Class Anthozoa
sedimentary
Garnet (almandine or pyrope variety)
Silicate mineral Group: (Fe, Mg, Mn, Ca)3(Al, Fe, Cr)2(SiO4)3
mineral
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Siltstone
Siltstone (primarily composed of SiO2 with various clay minerals)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite)
sedimentary
Quartzite (specifically a river-worn cobble)
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Greenschist (Greenstone)
Greenschist (Metamorphic rock containing chlorite, actinolite, and epidote)
metamorphic
Druzy Quartz (on Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Agatized Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Yellow Jasper
Jasper (Silicon Dioxide, SiO2 plus various mineral impurities)
sedimentary
Bloodstone Jasper (Heliotrope)
SiO2 (Silicon Dioxide) - Cryptocrystalline Quartz
sedimentary
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
mineral
Granitic Pegmatite
Granitic Pegmatite (principally Quartz, Potassium Feldspar, and Mica)
igneous
Brown Chalcedony (Agate/Jasper blend)
Silicon dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Porphyritic Basalt (or Andesite) Pebble
Porphyritic Mafic Volcanic Rock
igneous
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Diabase (Greenstone)
Diabase (also known as Dolerite)
igneous
Black Opal
Hydrated silica (SiO2·nH2O)
mineraloid
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Dendritic Agate or Manganese Nodule in Chert/Limestone
Silicon Dioxide (SiO2) with Manganese Oxide (MnO2) inclusions
sedimentary
Basalt (River Stone)
Basalt (Aphanitic mafic volcanic rock)
igneous
Pumice or Scoria
Vesicular volcanic rock
Igneous
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral / Sedimentary component
Granitic Pegmatite
Granitic Pegmatite with Quartz and Feldspar
igneous
Metal Chain Belt with Square Plates
Not applicable (man-made)
Man-made Object (Metalwork)
Angelite
Anhydrite (Calcium Sulfate, CaSO4)
mineral
Echinoid Fossil (Sea Urchin Fossil)
Echinoidea (phylum Echinodermata), often preserved as Calcite (CaCO3)
sedimentary
Red Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Jasper (Red Jasper with Quartz veins)
Jasper (Silicon Dioxide, SiO2)
sedimentary
Wishing Stone (Basalt with Quartz Vein)
Basalt containing a microcrystalline quartz (SiO2) or calcite vein
igneous
River Stone (likely Basalt or Chert)
Silicon Dioxide (SiO2) for chert or Mafic Extrusive Rock for basalt
igneous/sedimentary
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
mineral