Amethyst
Amethyst (SiO₂)
Category
Browse sedimentary or igneous associated mineral specimens identified by the Rock Identifier community.
Amethyst
Amethyst (SiO₂)
Larvikite
Monzonite (intermediate intrusive igneous rock containing plagioclase, alkali feldspar, augite, and biotite)
Granite
Granite (Felsic Plutonic Rock)
Chert (Flint)
Silicon Dioxide (SiO2)
Red Jasper
Jasper (SiO2) with Hematite (Fe2O3) inclusions
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Ferruginous Sandstone (Ironstone)
Sedimentary rock with high iron oxide content (Fe2O3 / FeO(OH))
Jasper
Jasper (Silicon Dioxide, SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Schist
Schist
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
Pyrite
Iron Sulfide (FeS2)
Orange Calcite
Calcium Carbonate (CaCO3)
Banded Jasper with Hematite or Quartz
Silicon Dioxide (SiO2) with impurities
Chert (Flint)
Silicon Dioxide (SiO2)
Amazonite
KAlSi3O8 (Potassium Aluminum Silicate) - a variety of Microcline Feldspar
Chert (Nodular Chert)
Microcrystalline Silica (SiO2)
Fluorite
Calcium Fluoride (CaF2)
Amazonite (likely mixed with other feldspars/minerals)
Amazonite is a variety of Microcline, which is a tectosilicate mineral, formula KAISi3O8. The mixed beads could include other feldspars or quartz.
Aventurine
Aventurine Quartz (SiO2 with inclusions)
Diorite (or salt-and-pepper granite pebble)
Phaneritic Igneous Rock (Intermediate Composition)
Olivine Diabase Porphyry
Porphyritic Olivine-Bearing Diabase (Micro-Gabbro)
Moonstone
Orthoclase Feldspar (KAlSi3O8)
Apatite
Fluorapatite, Chlorapatite, and Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Quartz Mineral
Silicon Dioxide (SiO2)
Mica Schist
Mica Schist (predominantly Muscovite/Biotite)
Jasper or Chert
Silicon Dioxide (SiO2)
Crushed Stone / Greywacke
Greywacke (Indurated Sandstone)
Pyrite
Iron Sulfide (FeS2)
Chert (Red Jasper)
Silicon Dioxide (SiO2)
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
Granite
Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)
Pyrite
Iron Sulfide (FeS2)
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
Magnetite (Lodestone)
Magnetite (Fe3O4)
Pyrite
Iron Sulfide (FeS2)
Milky Quartz
Silicon Dioxide (SiO2)
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
Granite
Granite (Alkali-feldspar granite)
Rhyolite
Rhyolite