Sedimentary Rock (Possibly Composed Of Various Minerals)

Clear Quartz (Faceted Crystal)

Silicon Dioxide (SiO2)

Dalmatian Jasper

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

Petrified Wood

Silicified Wood (SiO2)

Sandstone (Quartzose Pebble)

Clastic Sedimentary Rock (Litharenite/Quartz arenite)

Mixed Rock Collection

Polymineralic aggregate

Shale with Vein Infillings

Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.

Sandstone

Clastic sedimentary rock

Sandstone (Iron-stained)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Dalmatian Jasper

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

Quartz

SiO2 (Silicon Dioxide)

Quartz Vein Rock

Silicon Dioxide (SiO2)

Granite (likely weathered granitic rock)

Granite; chiefly quartz (SiO₂), feldspar, and mica

Siltstone Pebble

Siltstone (composed of microscopic quartz and clay minerals)

Sandstone

Arenite (SiO2 based)

Sandstone

Clastic sedimentary rock

Tumbled Granite

Granite (composed of Quartz, Feldspar, and Mica)

Sandstone (likely a river or beach pebble)

Sandstone (a clastic sedimentary rock)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Red Sandstone

Arenite (Ferruginous Sandstone)

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 inclusions)

Possibly biotite-rich schist

Mica schist, composed mainly of quartz and mica (often biotite); exact identification is uncertain from the photo.

Diorite (possibly fine-grained variety or a related intermediate intrusive rock like a felsic gabbro or a dark granodiorite)

Diorite (Igneous rock, intrusive, intermediate composition)

Iron-stained quartz-rich rock (possibly ironstone or ochre-coated quartz)

Undetermined ferruginous rock; yellow-brown coloration likely from goethite and/or limonite (hydrated iron oxides)

Tumbled granite

Granite, a coarse-grained felsic intrusive igneous rock

Conglomerate

Conglomerate (Clastic sedimentary rock)

Sandstone

Arenite (SiO2 based typically)

Quartz

Silicon Dioxide (SiO2)

Basalt fragment

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and commonly olivine

Jasper

Microcrystalline Quartz (SiO2)

Tiger Iron

Tiger Iron (Composition: SiO2, Fe2O3, Fe3O4)

Red Sandstone

Arenite (primarily quartz with iron oxide cement)

Layered metamorphic rock, possibly banded gneiss

Gneiss (tentative; exact identification requires closer examination)

River Gravel

Polymictic Gravel / Detrital Rock Aggregate

Small rounded quartz-rich pebble

Likely quartz (SiO₂), possibly iron-stained or mixed with other minerals

Concrete

Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)

Limestone

Calcite-rich limestone (primarily CaCO₃)

Sandstone (specifically Lithic or Quartz Arenite)

Arenite (composed primarily of SiO2)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Greenish Metamorphic Rock (likely containing epidote or chlorite)

Metamorphic rock, possibly epidosite or greenstone

Script Jasper

Silicon Dioxide (SiO2) with impurities

Red Sandstone

Clastic sedimentary rock (often dominated by SiO2 with Fe2O3)

Sandstone

Sedimentary rock composed mainly of quartz sand-sized minerals