Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Category
Metamorphic Or Igneous (Context Dependent)
Browse metamorphic or igneous (context dependent) specimens identified by the Rock Identifier community.
Learn about Metamorphic Or Igneous (Context Dependent) in the encyclopedia
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Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red gemstone ring, possibly synthetic ruby or red glass
Unidentified red stone; ruby is corundum (Al₂O₃), but the image cannot confirm its identity
gemstone
Gold Placer (Gold Flakes and Nuggets)
Native Gold (Au)
mineral
Gold Ore
Native Gold (Au) in Matrix
mineral
Red Aventurine (Strawberry Quartz / Sunstone Quartz)
Silicon Dioxide with Hematite/Goethite inclusions (SiO2)
mineral
Raw Emerald (Emerald Beryl)
Beryl (Be3Al2Si6O18) with chromium/vanadium impurities
mineral
Sandstone
Sandstone (Quartzose/Feldspathic Sandstone)
sedimentary
Emerald
Beryl (Be3Al2(SiO3)6)
gemstone
Orange Calcite
Calcite (CaCO3)
Mineral
Anthracite Coal
Anthracite (high-rank coal)
metamorphic
Green Quartzite (Aventurine-like)
Quartzite (primarily SiO2 with chromium-rich mica or chlorite inclusions)
metamorphic
Weathered basalt pebble
Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and commonly olivine
igneous
Raw Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Black Onyx
Silicon Dioxide (SiO2) with parallel banding
mineral
Weathered iron-rich rock, likely basalt or ironstone
Probable weathered basalt (mafic silicate rock); exact identification requires a fresh surface and testing
igneous
Chert (Arrowhead Fragment)
Silicon Dioxide (SiO2)
sedimentary
Fossilized bivalve or brachiopod shell
Indeterminate calcitic shell fossil; likely Bivalvia or Brachiopoda
fossil
Flint (chert) hand axe
Cryptocrystalline silica (SiO₂), worked into a bifacial stone tool
sedimentary
Bull Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Gold Ore in Matrix
Native Gold (Au) in Quartz/Host Rock
mineral
Yellow Sapphire
Corundum (Al2O3)
mineral
Geode or Concretion
Silica-rich Concretion or Unopened Geode (SiO2)
sedimentary
Cloud Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Polished basalt pebble
Basalt, primarily plagioclase feldspar, pyroxene, and iron-titanium oxides
igneous
Dragon Blood Jasper
Epidote with Red Piedmontite (silicate)
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Turquoise
Hydrous phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)
mineral
Red glass-like crystal, likely synthetic ruby or red glass
Uncertain from image; possible corundum (ruby), Al₂O₃, or synthetic glass
gemstone
Green Quartz / Prasiolite
Silicon Dioxide (SiO2)
mineral
Yellow Sapphire
Corundum (Al2O3:Fe)
gemstone
Ruby (Pinkish-Red)
Corundum (Al2O3 with Chromium trace)
mineral
Quartz Vein on Matrix
Silicon Dioxide (SiO2)
mineral
Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2)
mineral
Iron-rich concretion or weathered ironstone
Limonite/goethite-rich ironstone; commonly hydrated iron oxides, chiefly FeO(OH)·nH₂O
sedimentary
Polished brecciated jasper
Jasper, an opaque microcrystalline quartz variety (SiO₂), with iron-oxide and clay/mineral inclusions
gemstone
Unidentifiable embedded dark fragment
Indeterminate; possibly a dark silicate mineral or lithic inclusion
mineral
Basalt (Crushed Stone)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Blue Sapphire
Corundum (Al2O3)
gemstone
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Yellow Aventurine
Quartz (SiO2) with inclusions
mineral