Anthropogenic (Man Made Material)

Sandstone (with potential trace fossils)

Clastic sedimentary rock (primarily SiO2)

Sunstone

Oligoclase (a variety of Plagioclase Feldspar) - (Na,Ca)(Si,Al)4O8

Biotite on Quartz

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2) and Quartz (SiO2)

Limestone with Iron Inclusions

Calcium Carbonate (CaCO3) with Hematite/Limonite

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 principal)

Red Sandstone

Arenite (Ferruginous Sandstone)

Quartzite (River Pebble)

Quartzite (primarily SiO2)

Red Jasper

Jasper (SiO2 with Fe2O3 inclusions)

Fossiliferous Limestone

Limestone (CaCO3) with Crinoid/Bivalve fossils

Quartzwacke / Impure Sandstone

Arenite with minor lithic fragments (Silicon Dioxide matrix)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Fe2O3 staining)

Charoite

Charoite (K(Ca,Na)2Si4O10(OH,F)·H2O)

Limestone (specifically Grainstone or Micrite)

Calcium Carbonate (CaCO3)

Granite

Granite (composed mainly of Quartz, Feldspar, and Mica)

Gneiss

Gneiss

Sandstone (Ferruginous)

Clastic Sedimentary Rock (Litharenite)

Sunstone (Feldspar)

Plagioclase Feldspar ((Ca, Na)(Al, Si)4O8)

Sandstone (Quartz-rich)

Arenite (primarily SiO2)

Siltstone

Siltstone (SiO2, Fe2O3, Al2O3 mix)

Sandstone (with Iron Staining)

Arenite (SiO2 predominantly)

Iron meteorite fragment (likely weathered meteorite)

Fe–Ni metal, commonly kamacite with taenite; possible stony-iron or iron-oxide fusion crust

Quartz-rich rock, likely chert or chalcedony

Microcrystalline silica (SiO₂), possibly quartz/chalcedony

Polished brown jasper

Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Goldfish Cracker (Culinary Mimic)

Cibus aurum (Commonly composed of Enriched Wheat Flour and Cheddar Cheese)

Tumbled carnelian (likely chalcedony)

Carnelian, orange-red cryptocrystalline quartz (SiO₂), a variety of chalcedony

Green Chert (Jasper)

Silicon Dioxide (SiO2)

Sandstone (likely Arkosic or Lithic Sandstone)

Arenite (SiO2 based with mineral inclusions)

Possible iron-rich concretion or weathered ironstone

Goethite/limonite-rich ironstone; exact identification requires testing

Bamboo Leaf Jasper

Silicified Siltstone or Jasper (SiO2)

Coarse-grained granite or granitic pegmatite

Granite; primarily quartz (SiO₂), feldspar, and mica/amphibole

Dark mafic igneous rock, likely basalt or gabbro

Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, possibly olivine

Granite-like rock

Felsic intrusive igneous rock, likely granite or granodiorite

Polished pink feldspar pebble

Orthoclase or microcline feldspar, KAlSi₃O₈; exact identification is uncertain from the image

Quartz-lined vesicle in basalt (amygdaloidal basalt)

Amygdaloidal basalt with drusy quartz; predominantly plagioclase, pyroxene, and iron oxides

Tumbled gray-green metamorphic rock, likely serpentinite or chlorite schist

Serpentinite/chlorite-rich ultramafic metamorphic rock; commonly dominated by antigorite, lizardite, or chlorite with minor magnetite and talc

Quartz-veined Siltstone

Siltstone with Quartz (SiO2) veins

Turquoise

Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O

Labradorite-bearing anorthosite

Anorthosite, chiefly plagioclase feldspar (labradorite; approximately (Ca,Na)(Al,Si)₄O₈)

Olivine in Basalt matrix

Peridotite (Mg, Fe)2SiO4

Likely quartz crystal fragment

Quartz (SiO₂), possibly a small tumbled or cleaved fragment