Polished brecciated jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), with iron-oxide and possibly manganese-rich inclusions
mineral
Category
Anthropogenic (Man Made Product Subject To Geological Processes)
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Amethyst cluster
Quartz, SiO₂, purple variety (amethyst)
mineral
Anthracite Coal
Carbon (with trace impurities)
sedimentary
Tumbled pale green aventurine or chalcedony
Quartz-group silica, primarily microcrystalline SiO₂; possible fuchsite-bearing aventurine
mineral
Weathered iron-rich rock fragment
Likely limonite/goethite-rich ironstone; exact identification requires testing
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Greenstone / Serpentinite
Serpentinite (complex of Mg, Fe, Ni, Al, Zn, Mn silicate minerals including Antigorite, Lizardite, and Chrysotile)
metamorphic
Granite
Granite (a common rock type, not a single mineral species)
Igneous
Iron-stained weathered rock
Unknown
Unknown (likely sedimentary or metamorphic)
Likely chert (flint)
Microcrystalline quartz (SiO₂), likely chert; exact identification is uncertain from the image alone
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Quartz (SiO₂)
Mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Weathered concrete or cementitious slab (not natural rock)
Artificial calcium-silicate cement composite; likely Portland cement concrete
sedimentary
Flint (chert)
Microcrystalline quartz (SiO₂), a variety of chert
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartz-veined ironstone/jasper
Silicified ferruginous rock; predominantly microcrystalline quartz (SiO₂) with iron oxides/hydroxides, likely goethite and hematite
sedimentary
Hematite
Hematite (Fe2O3)
mineral
Flint (gray chert)
Microcrystalline quartz (SiO₂), a variety of chert
sedimentary
Specular Hematite with Pyrite
Iron Oxide (Fe2O3) with Iron Sulfide (FeS2)
mineral
Chalk
Carbonate rock (mainly CaCO3)
sedimentary
Sandstone (Quartzose)
Sandstone (SiO2 dominated)
sedimentary
Metallic sulfide mineral fragment, likely galena
Galena (lead sulfide, PbS), tentative identification
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Geode Nodules / Stream-Rounded Quartz)
Silicon Dioxide (SiO2)
mineral
Dyed Quartz (imitating Emerald/Green Quartz)
Silicon Dioxide (SiO2) with artificial pigment
mineral
Tumbled rhodonite
Rhodonite, manganese inosilicate (MnSiO₃)
mineral
Multicolor quartz bead bracelet
Quartz (silicon dioxide, SiO₂); bead colors may be from different varieties or treated quartz
gemstone
Man-made Glass (Tumbled/Shaped)
Amorphous Silicon Dioxide (SiO2) with metal oxide colorants
Mineraloid (synthetic)
Tumbled quartz (likely milky quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Quartz (possibly milky quartz or quartz with inclusions)
SiO2 (Silicon Dioxide)
Mineral
Porcelain (Stoneware Ceramic)
Mullite / Silica-glass composite (Al6Si2O13)
metamorphic (man-made)
Limestone (Weathered / Limonite-stained)
Sedimentary carbonate rock (CaCO3)
sedimentary
Brown chert (flint)
Microcrystalline quartz (SiO₂), varieties called chert or flint
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Pink Quartzite Pebble
Quartzite (SiO2)
metamorphic
Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Tumbled citrine quartz
Quartz, silicon dioxide (SiO₂), likely iron-colored variety
gemstone
Red Quartzite
Quartzite (SiO2)
metamorphic
Milky quartz pebble
Quartz, silicon dioxide (SiO₂)
mineral