Sedimentary Rock (Possibly Composed Of Various Minerals)

Tumbled brown translucent stone, likely quartz/jasper

Microcrystalline quartz (SiO₂), possibly iron-stained chalcedony or jasper

Bauxite

Bauxite (mixture of Hydrous Aluminum Oxides)

Purple Chalcedony

Silicon Dioxide (SiO2)

Granite

Felsic intrusive igneous rock

Sandstone

Arenite

Gneiss

Gneiss

Granite

Granite (Phaneritic intrusive igneous rock)

Sandstone

Arenite (SiO2 based with primary clasts 0.0625 to 2 mm)

Quartz

Silicon Dioxide (SiO2)

Red Sandstone

Clastic Terrigenous Sedimentary Rock (composed mostly of SiO2 with Fe2O3)

Sandstone Pebble

Arenite (primarily SiO2)

Weathered iron-rich rock, possibly meteorite

Uncertain; likely goethite/hematite-rich material, with meteorite possibility

Sandstone

Sedimentary Clastic Rock

Sandstone (likely Quartzose Sandstone pebble)

Arenite (primarily SiO2)

Quartz-rich gravel fragment

Quartz (silicon dioxide, SiO₂), possibly with feldspar or carbonate inclusions

Lapis Lazuli

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2

Hematite

Iron(III) oxide (Fe2O3)

Granite / Feldspar gravel

Granite (felsic intrusive igneous rock)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Slate

Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)

Smoky Quartz

SiO2 (Silicon Dioxide)

Sandstone

Quartz Arenite / Sedimentary Rock

Sandstone

Arenite

Chalcedony (Yellow Agate / Carnelian Chalcedony)

Silicon Dioxide (SiO2)

Sandstone

Clastic sedimentary rock

Sandstone

Arenite (composed primarily of SiO2)

Clear Quartz (Rock Crystal)

Crystalline Silicon Dioxide (SiO2)

Likely quartz-rich mineral fragment

Quartz (SiO₂), possibly iron-stained or included quartz

Sandstone/Quartzite

Sedimentary Rock (composed mainly of SiO2)

Ferruginous Sandstone (Ironstone)

Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)

Chert Nodule

Microcrystalline Quartz (SiO2)

Brecciated jasper/chalcedony

Silica-rich breccia composed mainly of microcrystalline quartz (SiO₂), with iron-oxide and possibly epidote or chlorite inclusions

Sandstone (Pebble)

Arenite

Weathered quartz-rich rock, possibly granite or granitic pegmatite

Indeterminate quartz–feldspar aggregate; likely granite/pegmatite

Generic Rock Fragment

Rock Fragment

Mixed Rock and Mineral Collection

Various geological specimens

Sandstone with Iron Weathering

Quartz Arenite / Weathered Sandstone

Sandstone

Sedimentary Rock (Quartz arenite / Lithic sandstone)

Sandstone (Red Sandstone)

Arenite (predominantly SiO2 with Fe2O3 cement)

Sandstone

Clastic Sedimentary Rock

Sandstone

Sandstone (Arenite)

Chalcedony

Silicon dioxide (SiO2)