Quartzite
Quartzite (SiO2)
metamorphic
Category
Industrial Byproduct (Anthropogenic Rock)
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Porphyritic polymictic breccia (likely volcanic breccia)
Volcanic breccia; probable polymictic andesite–dacite breccia with quartz/feldspar clasts
igneous
Schist
Mica Schist
Metamorphic Rock
Blue Sapphire
Corundum (Al2O3 with iron and titanium trace elements)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Milk Quartz (White) and Yellow Aventurine (Yellow)
Silicon Dioxide (SiO2)
mineral
Diamond (or Diamond Simulant)
C (Carbon) or synthetic equivalent
gemstone
Quartz / River Cobble
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Peridotite Xenolith (Olivine)
Peridotite (predominantly Forsterite, (Mg,Fe)2SiO4)
igneous
Fancy Jasper (Ocean Jasper or River Jasper variant)
Silicon Dioxide with inclusions (SiO2)
sedimentary
Pegmatite
Igneous Pegmatite
igneous
Green Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Basalt
Basalt (Aphanitic extrusive igneous rock)
igneous
Anthracite Coal
Low-grade metamorphic carbonaceous rock
metamorphic
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Vesicular quartz-rich rock, possibly weathered rhyolite or silicified volcanic breccia
Silica-rich volcanic rock; likely microcrystalline quartz (SiO₂) with altered feldspar and iron-oxide staining
igneous
Quartzite (Iron-stained)
Metamorphosed Quartz-rich Rock (SiO2)
metamorphic
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Brachiopod Fossil in Limestone
Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Green glass sphere/marble
Soda-lime glass (primarily SiO2, Na2O, CaO)
Man-made object (Simulant)
Sandstone (with cross-bedding)
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Bumble Bee Jasper
Calcite-bearing Volcanic Tuff (not a true Jasper)
sedimentary
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Greenschist
Greenschist facies rock
Metamorphic
Desert Rose (Baryte or Gypsum Rose)
Baryte (BaSO4) or Gypsum (CaSO4·2H2O)
mineral
Chalcanthite (Likely Synthetic/Lab-Grown)
Hydrated copper(II) sulfate (CuSO4·5H2O)
mineral
Weathered basalt or iron-rich river cobble
Basalt, likely with iron-oxide staining; exact identification requires testing
igneous
Schist
Mica Schist (Group of medium-grade metamorphic rocks)
metamorphic
Quartz-rich hydrothermal ore rock, likely gold-bearing quartz vein
Milky quartz (SiO₂) with iron-oxide staining and probable sulfide minerals; host rock may be schist or altered granite
metamorphic
Quartz with Mica Schist Matrix
Quartz (SiO2) in Mica Schist Matrix
metamorphic
Tumbled red jasper
Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions
mineral
Red Sandstone
Arenite (with Iron Oxide / Hematite), Formula: SiO2 (Quartz) + Fe2O3 (Hematite coating)
sedimentary
Small rounded pebble
Indeterminate lithic grain; likely weathered sandstone, iron-stained quartz-rich rock, or a concretion
sedimentary
Peridotite (Dunite/Peridot Xenolith)
Peridotite (predominantly Olivine (Mg, Fe)2SiO4)
igneous
Garnet Schist
Almandine-bearing Mica Schist
metamorphic
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Basalt with Magnetite
Crystalline Basalt (Primarily Plagioclase and Pyroxene) with Magnetite (Fe3O4)
igneous
Granite
Phaneritic plutonic rock (dominated by Quartz, Feldspar, and Mica)
igneous