Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Category
Organic (If Resin) Or Synthetic (If Glass); Simulating Sedimentary Or Metamorphic (For Natural Stones)
Browse organic (if resin) or synthetic (if glass); simulating sedimentary or metamorphic (for natural stones) specimens identified by the Rock Identifier community.
Agate / Banded Chalcedony
Agate (Silicon Dioxide / SiO2)
mineral
Geode with Quartz/Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Garnet
Garnet Group (Silicate mineral); general formula X3Y2(SiO4)3
Mineral
Peacock Ore
Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with iridescent tarnish
mineral
Green Onyx (Banded Calcite)
Travertine (CaCO3 - Calcium Carbonate)
sedimentary
Red Garnet (Almandine-Pyrope series)
Garnet Group, Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)
mineral
Yellow Quartz (Citrine Quartz)
Silicon Dioxide (SiO2)
mineral
Pink Anthracite Coal (dyed)
Anthracite Coal (Artificially Colored)
Sedimentary Rock (Altered)
Emerald in Matrix
Beryl (Be3Al2Si6O18) containing Chromium/Vanadium impurities
mineral
Hematite Beads
Hematite (Fe2O3)
Mineral
Rose Quartz Carving
Quartum roseum (Variety of Quartz, SiO2)
Mineral
Micaceous Sandstone or Quartzite
Sandstone (lithified quartz grains, often with mica) or Quartzite (metamorphosed sandstone)
Sedimentary or Metamorphic
Blue Apatite
Apatite (Ca5(PO4)3(F,Cl,OH))
mineral
Banded Gneiss
Gneiss (pronounced 'nice')
metamorphic
Chert (variations include Flint/Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
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
Amber
Amber (Fossilized Tree Resin)
Mineral
Greenstone
Greenschist (metamorphosed mafic igneous rock)
metamorphic
Blue Crackle Quartz (Dyed Quarzite)
Silicon Dioxide (SiO2) with artificial dye
Metamorphic (modified)
Quartz Vein in Host Rock (Gossanous Matrtix)
Silicon Dioxide (SiO2) with iron oxides (Limonite/Hematite)
mineral
Greenschist
Greenschist facies rock
Metamorphic
Septarian Nodule (Yellow Calcite in Limestone)
Septarian Concretion (CaCO3 with Aragonite and Calcite)
sedimentary
Schist
Mica Schist
metamorphic
Agate (specifically Carnelian Agate or Lake Superior style Agate)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Milky Quartz with Epidote or Chlorite inclusions
Silicon Dioxide (SiO2) with inclusions of Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Greywacke (River Slikkenstone)
Greywacke (Impure Sandstone)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Emerald
Beryl (Be₃Al₂Si₆O₁₈), specifically the green variety colored by trace amounts of chromium or vanadium.
Mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone Concretion with Quartz Center
Sedimentary Clastic Rock (SiO2 matrix with Quartz core)
sedimentary
Quartz (in a rock matrix)
Quartz (SiO2)
mineral
Granite (Weathered)
Phaneritic Felsic Igneous Rock
Igneous
Citrine
Silicon Dioxide (SiO2)
mineral
Limonite with Opal infusion
FeO(OH)·nH2O (Limonite) / SiO2·nH2O (Opal)
mineral
Blue Quartzite (Aventurine)
Quartzite (primarily SiO2) with inclusions of Dumortierite or Magnesio-riebeckite
metamorphic
Desert Varnish (on Sandstone)
Rock Varnish (composed of Manganese oxides, Iron oxides, and Clay minerals)
sedimentary
Chert Geode or Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Apatite Sphere (Polished)
Fluorapatite / Ca5(PO4)3F
mineral