Smoky Quartz with Hematite Inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Category
Not A Natural Rock (Man Made Composite)
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Blue Dyed Agate
Cryptocrystalline Quartz (SiO2)
mineral
Rounded sandstone pebble
Quartz-rich sandstone (likely arkosic or lithic sandstone)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Black Beach Pebble (Basalt/Greywacke Pebble)
Aphanitic Mafic Igneous Rock / Basalt
igneous
Hag Stone
Perforated Chert (Microcrystalline Silica, SiO2)
sedimentary
Unakite-like granite with a white feldspar inclusion
Granite, chiefly quartz–feldspar–biotite; pale inclusion likely albite/orthoclase feldspar
igneous
Dyed Agate Geode Slice
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Obsidian
Volcanic Glass
igneous
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Sandstone
Arenite (SiO2 primarily)
sedimentary
Blue Onyx (Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Diamond
Diamond (Pure Carbon, C)
mineral
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Small polished brown stone
Indeterminate; possibly tumbled jasper, brown agate, or another iron-stained silicate
mineral
Amethyst
Quartz (Silicon Dioxide with Iron impurities), SiO2
mineral
Jasper and Yellow Chert (Tumbled)
Microcrystalline Quartz (SiO2)
sedimentary
Boulder Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone (River Cobble / Pebble)
Sedimentary Rock (Quartz Sandstone / Arenite)
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Weathered sandstone or iron-stained siltstone
Quartz-rich clastic sedimentary rock, likely ferruginous sandstone
sedimentary
Brown Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky/Milky Pebble)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)
mineral
Blue Howlite (Dyed)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Gneiss (Metamorphosed Granitic Rock)
Gneiss (composed mainly of quartz, feldspar, biotite, and/or hornblende)
metamorphic
Tumbled blue-green stone, likely aquamarine-bearing pegmatite or blue apatite
Probable fluorapatite, Ca5(PO4)3(F,Cl,OH), though visual identification is uncertain
mineral
Sandstone
Arenite (SiO2 dominant)
sedimentary
Quartz-bearing granite or gneiss fragment
Granite/gneiss composed mainly of quartz (SiO₂), feldspar, and minor mica or ferromagnesian minerals
igneous
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Aquamarine
Beryllium Aluminum Silicate (Be3Al2Si6O18)
gemstone
Tumbled lapis lazuli
Lapis lazuli; predominantly lazurite, (Na,Ca)₈(AlSiO₄)₆(S,SO)₄, with calcite and pyrite
metamorphic
Chevron Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Weathered granite-like rock
Granite, likely biotite-bearing; exact identification is uncertain from the image
igneous
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral