Sulfur (on Matrix)
Native Sulfur (S8)
Category
Browse sedimentary or igneous associated mineral specimens identified by the Rock Identifier community.
Sulfur (on Matrix)
Native Sulfur (S8)
Epidosite
Epidosite (predominantly Epidote {Ca2Al2Fe3+Si3O12(OH)} and Quartz {SiO2})
Granite
Intrusive Igneous Rock
Garnet crystals
Garnet-group silicates, likely almandine (Fe₃Al₂Si₃O₁₂)
Gold in Quartz Ore
Hydrothermal Quartz with native Gold (Au)
Turtleback Rock (Brecciated Diabase / Granite)
Brecciated hypabyssal intrusive rock
Granite
Granite (Felsic Plutonic Rock)
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
Green Onyx (Banded Calcite)
Travertine (CaCO3 - Calcium Carbonate)
Diorite
Intermediate plutonic igneous rock
Chrysanthemum Stone
Chrysanthemum Stone (Calcite/Celestite/Strontianite in Limestone)
Jasper
Microcrystalline Quartz (SiO2)
Green Fluorite
Calcium fluoride (CaF2)
Quartz-rich pegmatite or quartz vein rock
Mostly quartz (SiO₂), with probable feldspar and iron-oxide staining
Peach Moonstone
Orthoclase Feldspar (KAlSi3O8) with inclusions
Black tourmaline (likely schorl)
Schorl, NaFe3Al6(BO3)3Si6O18(OH)4
Vesicular volcanic scoria (likely basaltic scoria)
Scoria; predominantly iron- and magnesium-rich silicate glass with plagioclase, pyroxene, and possible olivine
Agate
Agate (Silicon Dioxide, SiO2)
Howlite
Howlite (hydrated calcium borosilicate; Ca₂B₅SiO₉(OH)₅)
Blue Kyanite
Kyanite (Al2SiO5)
Vesicular Basalt
Vesicular Basalt
Polished ocean jasper (orbicular jasper), likely
Silica-rich microcrystalline quartz/chalcedony aggregate, commonly with feldspar, epidote, and iron oxides; composition varies
Granite
Granite (Phaneritic Quartz-Feldspar Rock)
Polished sodalite pendant
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, likely with minor albite or nepheline
Specular hematite (likely iron-rich ore)
Hematite, Fe₂O₃; possibly magnetite-bearing
Fluorite (Green Fluorite)
Fluorite (Calcium Fluoride, CaF2)
Leopard Jasper
Microcrystalline Quartz (SiO2)
Apatite
Fluorapatite (Ca5(PO4)3F)
Quartz
Silicon dioxide (SiO2)
Greenstone
Greenschist-facies basaltic rock
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
Blue Apatite
Chlorapatite / Fluorapatite (Ca5(PO4)3(F,Cl,OH))
Milky quartz (likely iron-stained quartz)
Quartz, silicon dioxide (SiO₂)
Pink Chalcedony
Silicon Dioxide (SiO2)
Tree Agate
Silicon Dioxide (SiO2) with dendritic inclusions
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
Bornite (Peacock Ore) / Acid-treated Chalcopyrite
Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Native Gold (in the form of jewelry)
Gold (Au)
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
Gold Flake
Native Gold (Au)
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)