Sandstone
Arenite (SiO2 primarily)
sedimentary
Category
Not A Rock
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Sandstone (Iron-stained)
Arenite (primarily Quartz, SiO2)
sedimentary
Carnelian
Carnelian (Silicon Dioxide - SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Clear Quartz
SiO2 (Silicon Dioxide)
mineral
Slag (Industrial Byproduct)
Artificial silicate/iron byproduct
Mineral description (Anthropogenic material)
Sandstone
Arenite (composed of SiO2, CaCO3, or iron oxides)
sedimentary
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
White Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Red Jasper (possibly Red Coral or dyed Howlite)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Red Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Sandstone (likely Arkosic or Lithic Sandstone)
Clastic Sedimentary Rock (SiO2 with assorted minerals)
sedimentary
Sandstone
Arenite (primarily SiO2 - Silicon Dioxide)
sedimentary
Sandstone (likely Arkosic)
Clastic Sedimentary Rock (primarily SiO2 with Feldspar)
sedimentary
Sandstone (Greywacke/Lithic Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Porphyritic Basalt (Chinese Writing Stone)
Porphyritic Basalt or Porphyritic Andesite
igneous
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Basalt
Extrusive Igneous Rock (Mafic)
igneous
Sandstone (likely Siltstone or Mudstone)
Clastic sedimentary rock (primarily SiO2 with various oxides)
sedimentary
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Greenish rock with white veins, possibly epidote or chlorite bearing rock with quartz/calcite veins
Altered mafic rock or Epidosite
metamorphic or igneous alteration
Felsic Igneous Rock (likely Rhyolite or weathered Granite)
Felsic Volcanic/Plutonic Rock
igneous
Diorite
Diorite (intermediate plutonic rock)
igneous
Arkosic Sandstone
Arkose (Clastic Sedimentary Rock)
sedimentary
Sandstone
Arenite (primarily Quartz-based Sandstone)
sedimentary
Sandstone Pebble
Arenite (Sandstone)
sedimentary
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Banded Agate
Cryptocrystalline variety of Quartz (SiO2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
mineral
Agate (Moss or Green Agate)
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartz (Milky or Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Carnelian Agate
Silicon Dioxide (SiO2)
mineral
Ptygmatic Migmatite
Migmatite (consisting of Neosome and Paleosome fractions)
metamorphic
Sandstone (Pebble/Cobble)
Arenite (primarily SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Brown Variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary