Sandstone
Arenite (SiO2-rich)
sedimentary
Category
Not A Natural Rock
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Sandstone (Quartz-rich)
Arenite (SiO2)
sedimentary
Granite
Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)
igneous
Dalmation Stone (Dalmation Jasper)
Peralkaline Rock with Feldspar and Arfvedsonite
igneous
Quartz Pebble / Quartzite Pebble
SiO2 (Silicon Dioxide)
sedimentary
Sandstone Pebble
Arenite (SiO2 dominated with iron oxide)
sedimentary
Hag Stone
Perforated Quartz Pebble / Sedimentary Rock
sedimentary
Slate
Slate (Metamorphic Rock)
metamorphic
Red Granite
Phaneritic Felsic Igneous Rock
igneous
Tumbled agate (likely Botswana or fortification agate)
Microcrystalline quartz, SiO₂ (chalcedony with banded impurities)
mineral
Sandstone (Ferruginous / River-worn Cobble)
Sandstone (SiO2 with iron oxide impurities)
sedimentary
Sandstone
Arenite
sedimentary
Riverstone Quartzite (Water-worn Siltstone/Quartzite)
Metamorphosed Quartz-rich Arenite (SiO2)
metamorphic
Sandstone (Micaceous)
Arenite (composed primarily of SiO2)
sedimentary
Brachiopod Fossil (Spiriferid)
Order Spiriferida (Phylum Brachiopoda); mineralized as Calcite (CaCO3) or Chert (SiO2)
sedimentary (fossilized organic remain)
Conglomerate
Conglomerate rock (detrital sedimentary)
sedimentary
Sandstone (Ferruginous)
Sandstone (SiO2 with iron oxide inclusions)
sedimentary
Sandstone (Ferruginous)
Arenite (with Hematite/Limonite cement)
sedimentary
Tumbled amber-colored chalcedony or jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
mineral
Shale
Lutaceous Rock (Sedimentary Mudrock)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone (River Cobble / Pebble)
Sedimentary Rock (Quartz Sandstone / Arenite)
sedimentary
Basalt
Mafic Igneous Rock
igneous
Sandstone (likely Siltstone or fine-grained Sandstone)
Sedimentary Rock (Clastic)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Phaneritic Plutonic Felsic Rock
igneous
Dyed Agate Geode Slice
Silicon Dioxide (SiO2) - Banded Chalcedony
mineral
Sandstone
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Asphalt aggregate (crushed stone in bitumen)
Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen
sedimentary
Pink Dyed Agate
Chalcedony (SiO2) with artificial dyes
mineral
Sandstone (with Iron Staining)
Arenite (Silicon Dioxide, SiO2, often with iron oxides like Limonite)
sedimentary
Hag Stone (Sandstone with Boreholes)
Bored Sandstone (Sedimentary rock with lithophaga-style borings)
sedimentary
Pink Dyed Agate
Silicon Dioxide (SiO2) with synthetic pigment
mineral
Shale with Coprolite influence
Argillaceous sedimentary rock (Shale/Mudstone)
sedimentary
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 dominant)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Sandstone (Quartzose)
Arenite (SiO2 principal)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz Geode / Chalcedony Nodule
Quartz (Silicon Dioxide - SiO2)
mineral