Synthetic Material (Not A Rock Or Mineral)

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Gneiss (Banded Gneiss)

Gneiss

Granite

Granite (felsic intrusive igneous rock)

Polished/patinated jasper slab

Microcrystalline quartz (SiO₂), commonly chalcedony with iron-oxide and clay inclusions

Conglomerate

Clast-supported polymict conglomerate

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

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

Orbicular granite (likely larvikite/rapakivi-type granite)

Granite; chiefly quartz, alkali feldspar, plagioclase, with dark biotite/amphibole and iron-oxide veining

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Pink chalcedony (likely rough agate/chalcedony)

Microcrystalline quartz, SiO₂; chalcedony variety, possibly iron-bearing

Petrified Wood

Silicified Wood (Permineralized organic matter, głównie $SiO_2$)

Red Sandstone

Clastic Sedimentary Rock (typically contains Quartz and Iron Oxide)

Sandstone (Quartzose)

Arenite (Formula: SiO2 primary, with various cements)

Quartzite River Rock

Metamorphosed Quartz-rich Sandstone (SiO2)

Sandstone (Pebble)

Sandstone (arenite, arkose, wacke depending on composition)

Sandstone

Arenite (Secondary classification based on grain size)

Ferruginous Sandstone

Clastic Sedimentary Rock with Iron Oxide Cement

Ferruginous Sandstone

Sandstone (enriched with Iron Oxide)

Sandstone (Quartz-rich Pebble)

Arenite (primarily SiO2)

Moldavite

Tektite (Silicates with aluminum, iron, manganese, and potassium oxide glass)

Sandstone or Mudstone

Sedimentary Rock

Quartz (Druzy) in host rock

SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)

Quartz

Silicon Dioxide (SiO2)

Weathered pink granite fragment

Granite, chiefly quartz, potassium feldspar, and plagioclase feldspar with minor mica

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Likely basalt

Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine

Red Sandstone

Ferruginous Sandstone (SiO2 with Iron Oxide impurities)

Chert Pebble with Quartz Veins

Microcrystalline Quartz (SiO2)

Yellow Jasper

Jasper, a microcrystalline variety of Quartz (SiO2) with iron inclusions

Unidentified weathered rock fragment

Likely granitic or feldspathic rock; exact identification requires clearer imaging and testing

Weathered granitic rock

Granite, likely biotite granodiorite

Iron-stained quartz-rich rock, possibly jasper or chert

Microcrystalline quartz (SiO₂) with iron oxides/hydroxides

Reddish-brown rounded pebble, likely iron-stained sandstone or chert

Probable quartz-rich sandstone (SiO₂), possibly ferruginous chert; exact identification requires testing

Chert (Sedimentary Rock)

Silicon Dioxide (SiO2)

Gneissic Schist

Foliated Metamorphic Rock (Schist/Gneiss transition)

Yellow Chert (Jasper)

Microcrystalline Quartz (SiO2)

Quartz Mica Schist

Mica-Quartz Schist (Chemical: SiO2 + KAl2(AlSi3O10)(OH)2)

Mica-rich metamorphic rock, likely schist

Biotite–muscovite schist, possibly garnet-bearing

River Pebble

Siliceous rock fragment

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Granite Pebble

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

Banded Sandstone

Arenite (composed primarily of Quartz: SiO2)