Nephrite Jade
Tremolite-actinolite series (Ca2(Mg,Fe)5Si8O22(OH)2)
metamorphic
Category
Mineral In Metamorphic Rock
Browse mineral in metamorphic rock specimens identified by the Rock Identifier community.
Vesicular Basalt with Epidote
Vesicular Basalt (Mg, Fe)2SiO4 with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Bauxite
Bauxite (Mixture of Hydrous Aluminum Oxides)
sedimentary
Granitic Pegmatite
Pegmatitic Granite
igneous
Fulonite (Fulgurite-like)
Fulgurite (SiO2 fused silica/lechatelierite)
Metamorphic (Pseudo-igneous)
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Biotite / Black Mica
K(Mg,Fe)3(AlSi3O10)(F,OH)2
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Crystal Fragment)
Quartz / Silicon Dioxide (SiO2)
mineral
Agate (specifically, multi-colored or pastel-dyed agate)
Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).
Mineral
Peacock Ore
Bornite (Cu5FeS4)
mineral
Marble
Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.
Metamorphic Rock
Basalt (Amygdaloidal)
Amygdaloidal Basalt
igneous
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate)
mineral
Sandstone (Iron-stained)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Grey Quartzite Pebble
Quartzite (primarily SiO2 - Silicon Dioxide)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Greenschist (Greenstone)
Chlorite schist (primarily Chlorite-Epidote-Actinolite-Albite)
metamorphic
Quartz (likely Yellow/Orange variety, possibly Citrine or Chalcedony with iron staining)
Quartz (SiO₂)
Mineral
Calcite
Calcite (Mineral, Calcium Carbonate - CaCO3)
Mineral
Green Aventurine
Silicon Dioxide (SiO2) with Chromium-rich Fuchsite mica
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Quartz (chalcedony variety) or Limestone with Quartz Veins
SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)
Mineral or Sedimentary Rock (with mineral inclusions)
Gneiss
Gneiss
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Amethyst Quartz Druse
Silicon Dioxide (SiO2) with iron impurities
mineral
Amygdaloidal Basalt
Basalt with Secondary Mineral Infillings
igneous
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
Mineral
Rhodonite
Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3
mineral
Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Slate
Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.
sedimentary
Fluorite (left), Sodalite (middle), Dumortierite/Tumbled Quartzite (right)
Calcium Fluoride (CaF2), Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2), Aluminum Borosilicate (Al7(BO3)(SiO4)3O3)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Red Siltstone (or Red Shale)
Clastic Sedimentary Rock (Composition: primarily Quartz, Clay minerals, and Hematite Fe2O3)
sedimentary