Carnelian
Carnelian (SiO2 - Silicon Dioxide with Iron Oxide impurities)
mineral
Category
Mixed (Predominantly Sedimentary And Igneous)
Browse mixed (predominantly sedimentary and igneous) specimens identified by the Rock Identifier community.
Shiva Lingam
Cryptocrystalline Quartz (Jasperiod Silicate with Iron Oxide inclusions)
sedimentary
Leopardskin Jasper
Jasper (a variety of microcrystalline Quartz)
Sedimentary
Cherry Creek Jasper (also known as Red Creek Jasper or Cherry Creek Agate)
Jasper, microcrystalline quartz (SiO₂)
Sedimentary Rock
Gossan (Iron Hat)
Limonitic Gossan (predominantly FeO(OH)·nH2O)
igneous/metamorphic derivative
Epidosite (Unakite-related)
Epidosite (predominantly Epidote, Ca2(Al2,Fe3+)(SiO4)3(OH))
metamorphic
Granite
Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)
igneous
Carnelian Agate
Silicon Dioxide with Hematite impurities (SiO2 + Fe2O3)
mineral
Chalcopyrite
Chalcopyrite (CuFeS2)
Mineral
Onyx (Black Onyx)
Silicon Dioxide (SiO2) - Chalcedony variety
Mineral
Crazy Lace Agate
Silicon dioxide (SiO2) - a variety of banded Chalcedony (cryptocrystalline quartz)
mineral
Magnetite
Iron(II,III) oxide (Fe3O4)
mineral
Limonite
Limonite (Hydrous iron oxides, predominantly Goethite FeO(OH)·nH2O)
mineral
Titanium Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral (man-enhanced)
Amethyst (Druzy Quartz)
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Banded Iron Formation (BIF)
Banded Iron Formation (predominantly Hematite, Magnetite, and Chert/Quartz)
sedimentary
Included Quartz Beads (likely Phantom Quartz or Garden Quartz)
Quartz (SiO2) with various mineral inclusions
Mineral
Crushed Limestone
Calcium Carbonate (CaCO3)
Sedimentary
Bi-Color Tourmaline (or Watermelon Tourmaline)
Tourmaline (complex borosilicate mineral group with general formula AD3G6(BO3)3T6O18(OH,O)4)
Mineral
Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
mineral
Tiger's Eye (Mineral Collection)
Tiger's Eye (SiO2 with crocidolite inclusions)
mineral
Pearl
Organic gemstone (Calcium carbonate / CaCO3 + Conchiolin)
mineral
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Amethyst
Silicon dioxide / Quartz (SiO2+Fe4+)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Blue Apatite
Apatite (Group), Ca5(PO4)3(F,Cl,OH)
mineral
Fired Clay Brick (Anthropic Rock substitute)
Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)
metamorphic (man-made / anthropic)
Banded Iron Formation (BIF)
Banded Iron Formation
Sedimentary
Moonstone
Adularia (orthoclase feldspar variety)
mineral
Aquamarine
Aquamarine (Beryl variety) - Be3Al2(Si6O18)
mineral
Amber (Copal)
Organic gemstone, fossilized tree resin (often immature amber or copal)
Mineral
Yellow Ochre / Limonite
Limonite (inter-mixed iron oxides and hydroxides, primarily FeO(OH)·nH2O)
mineral
Granite
Granite (a felsic intrusive igneous rock)
igneous
Serpentinite
Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)
Metamorphic Rock
Amber (Burmite)
Fossilized tree resin (Succinite variant)
Organic mineraloid
Herkimer Diamond
Double-terminated Quartz (Silicon Dioxide, SiO2)
mineral
Chrysocolla
Chrysocolla: Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O
mineral
Green Garden Quartz (Phantom Quartz)
Silicon Dioxide (SiO2) with Chlorite inclusions
mineral
Quartz Druzy (on Matrix)
Silicon Dioxide (SiO2)
mineral
Limonite (vibrant yellowish-brown iron oxide)
Limonite (FeO(OH)·nH2O)
mineral