Mineraloid (Human Made Geological Specimen)

Browse mineraloid (human made geological specimen) specimens identified by the Rock Identifier community.

Quartz with Hematite Inclusions

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)

mineral

Quartzite

Quartzite (primarily SiO2)

metamorphic

Honey Calcite

Calcium Carbonate (CaCO3)

mineral

Greenschist / Chloritaform Schist

Chlorite Schist (Group of Silicate Minerals)

metamorphic

Sandstone

Arenite (composed primarily of SiO2)

sedimentary

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

mineral

Chrysanthemum Stone

Celestine (SrSO4) or Calcite (CaCO3) in Limestone/Porphyry matrix

metamorphic

Quartz (Milky/Rose variety)

Silicon Dioxide (SiO2)

mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Garnet (likely Almandine or Pyrope)

Garnet Group (Fe3Al2Si3O12 or Mg3Al2Si3O12)

mineral

Greenstone

Metamorphosed Mafic Igneous Rock

metamorphic

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)

sedimentary

Slate

Slate (Regional metamorphic rock composed primarily of quartz, illite, and chlorite)

metamorphic

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

mineral

River Stone (likely Basalt or Chert)

Silicon Dioxide (SiO2) for chert or Mafic Extrusive Rock for basalt

igneous/sedimentary

Apache Tear (Obsidian)

Volcanic glass (SiO2 - Silicon Dioxide)

igneous

Rose Quartz

Silicon Dioxide (SiO2) with traces of titanium, iron, or manganese

Mineral

Quartz (Grain/Fragment)

Silicon Dioxide (SiO2)

mineral

Chert Nodule

Microcrystalline Quartz (SiO2)

sedimentary

Quartzite

Quartzite (primarily SiO2)

metamorphic

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Conglomerate (Asphaltic/Anthropogenic)

Clastic sedimentary rock / Bituminous mixture

sedimentary

Carnelian

Carnelian (SiO2 with Iron Oxide impurities)

mineral

Quartz / Quartzite

Silicon Dioxide (SiO2)

mineral / metamorphic

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Granite

Granite (Phaneritic igneous rock)

igneous

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

sedimentary

Limonite/Hematite Ironstone

Goethite-rich Ironstone (FeO(OH) · nH2O)

sedimentary

Sandstone (with carbonaceous plant fragments)

Arenite (composed primarily of SiO2)

sedimentary

Desert Rose

Selenite Rose (Gypsum: CaSO4·2H2O)

mineral

Epidote

Epidote (Ca2(Al2,Fe3+)AlSi3O12(OH))

mineral

Jade

There are two distinct minerals commonly known as Jade: Nephrite (a calcium magnesium silicate - Ca2(Mg,Fe)5Si8O22(OH)2) and Jadeite (a sodium aluminum silicate - NaAlSi2O6). Based on the image showing a typically softer, more fibrous appearance, it is likely Nephrite.

Mineral