Jasper
Silicon Dioxide (SiO2)
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
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Arsenopyrite with Schist Matrix
Arsenopyrite (FeAsS)
mineral
Peridot (Olivine)
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
Weathered quartz-rich rock fragment
Likely quartz-bearing feldspathic rock; exact identification requires testing
mineral
Quartz Vein in Host Rock (Breccia/Rhyolite)
Silicon Dioxide (SiO2) with matrix
Mineral in Igneous/Sedimentary host
Sapphire
Corundum (Al2O3)
gemstone
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Chert (Flint)
Chert (SiO2)
sedimentary
Quartz Pebbles
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (with Iron Oxide)
sedimentary
Fossil Snail
Gastropoda fossil
fossil
Sandstone
Arenite
sedimentary
Schist (with Iron Oxide)
Mica Schist
metamorphic
Tumbled Dalmatian jasper
Quartz-rich alkali rhyolite, commonly marketed as Dalmatian jasper; chiefly quartz, feldspar, and dark amphibole/biotite inclusions
igneous
Ruby / Pink Sapphire
Corundum (Al2O3 with Chromium impurities)
gemstone
Basalt River Pebble
Basalt
igneous
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Weathered granite or granitic pegmatite cobble
Granite/granitic rock, composed mainly of quartz (SiO₂), feldspar, and minor biotite or other dark minerals; the reddish-brown areas may be iron-oxide staining or weathered accessory minerals
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Chert (specifically Iron-stained River Cobble)
Silicon Dioxide (SiO2)
sedimentary
Pegmatite (Granitic)
Granitic Pegmatite containing Quartz, Feldspar, and Tourmaline (Schorl)
igneous
Sandstone (likely Siltstone or Mudstone)
Clastic sedimentary rock (primarily SiO2 with various oxides)
sedimentary
Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
sedimentary
Sandstone Pebble
Sandstone (primarily SiO2)
sedimentary
Mudstone
Argillite
sedimentary
Sandstone
Arenite (clastic sedimentary rock)
sedimentary
Vesicular Basalt
Aphanitic Mafic Igneous Rock (with Vesicular Texture)
igneous
Grey Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Chert (variations include Flint/Jasper)
Chert (SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Weathered granite or granitic gneiss pebble
Granite; mainly quartz (SiO₂), feldspar, and mica, with possible gneissic alteration
igneous
Peridot (Olivine)
Olivine, (Mg, Fe)2SiO4
mineral
Sandstone
Arenite
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone Pebble
Sandstone (primarily Quartz, SiO2)
sedimentary
Shale (or Mudstone)
Laminose Mudrock (composition: clay minerals, quartz, and mica flakes)
sedimentary
Red Sandstone
Arenite (Iron-rich)
sedimentary
Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone)
Silicified limestone or banded sedimentary rock with mineral veins
sedimentary
Weathered quartz-rich rock, possibly quartzite or quartz vein material
Quartz (SiO₂), likely with feldspar, mica, and iron-oxide staining
metamorphic
Quartz Geode (likely within Limestone or Dolomite matrix)
Quartz (SiO₂)
Mineral within a Sedimentary Rock
Chalcedony on Matrix
Silicon Dioxide (SiO2)
mineral