Sedimentary Or Igneous Fragment

Fossiliferous limestone

Bioclastic limestone, primarily calcite (CaCO₃), containing marine shell or coral fossils

Likely weathered granite or granitic gneiss fragments

Granite: quartz–feldspar–mica aggregate; possibly biotite granite or weakly foliated gneiss

Weathered quartz-rich rock fragment

Likely quartz-bearing feldspathic rock; exact identification requires testing

Quartz Pebble

Silicon Dioxide (SiO2)

Chert (Flint)

Chert (Microcrystalline or cryptocrystalline Quartz - SiO2)

Sandstone (with garnet granules)

Clastic sedimentary rock (primarily SiO2 with Fe3Al2(SiO4)3 inclusions)

Granitic Sand

Detrital sediment (predominantly Quartz, Feldspar, and Mica)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Pyrite

Iron Disulfide (FeS2)

Weathered igneous rock fragment, possibly granite or granitic gneiss

Indeterminate; likely quartz–feldspar–mica aggregate (granite), possibly foliated gneiss

Milky quartz (rough fragment)

Quartz, silicon dioxide (SiO₂)

Weathered limestone

Calcite-rich limestone, chiefly calcium carbonate (CaCO₃)

Granite fragment

Granite, chiefly quartz–feldspar–mica

Likely weathered quartz or feldspar grain

Uncertain; possibly quartz (SiO₂) or a feldspar mineral

Quartz (Clear / Rock Crystal)

Silicon Dioxide (SiO2)

Orthoclase Feldspar

Potassium aluminum silicate (KAlSi3O8)

Smoky Quartz and Chalcedony Geode Fragment

Silicon Dioxide (SiO2)

Banded Chert / Cryptocrystalline Quartz

Silicon Dioxide (SiO2)

Weathered gray rock fragment

Tentatively shale or fine-grained sandstone; exact identification requires testing

Likely weathered quartz-bearing rock fragment

Provisional identification: quartz-rich sandstone or microcrystalline quartz (SiO₂)

Unidentified yellow-orange mineral fragment

Possibly iron-stained quartz, calcite, or citrine; identification is uncertain from the image

Quartz-bearing metamorphic rock, likely garnet-mica schist

Quartz–mica schist with probable garnet and iron-oxide minerals

Small rounded mineral pebble, possibly quartz

Uncertain; likely microcrystalline or crystalline SiO₂ (quartz), potentially with iron-oxide staining

Chert or silicified sedimentary fragment (tentative)

Microcrystalline quartz (SiO₂), possibly silicified limestone or fossil-bearing chert

Pyrite

Iron Disulfide (FeS2)

White/green translucent tumbled mineral fragment

Likely calcite (CaCO₃), possibly fluorite (CaF₂) or glass-like feldspar; visual identification is uncertain

Small weathered rock fragment

Indeterminate; possibly carbonate-rich sandstone or limestone

Small tan rock fragment

Indeterminate; possibly quartz-rich sandstone or iron-stained quartz

Pyrite

Iron Sulfide (FeS2)

Milky Quartz (Druzy Geode fragment)

Silicon Dioxide (SiO2)

Sandstone-based Concrete Fragment

Cementitious Composite with Sedimentary Aggregate

Granite fragment

Granite (Felsic Plutonic Rock)

Weathered mafic rock fragment

Likely basalt or volcanic breccia; identification is uncertain from the photograph

Conglomerate

Sedimentary Conglomerate

Black Beauty Meteorite

NWA 7034 (Northwest Africa 7034)

Rounded brown river pebble

Indeterminate lithic fragment; likely weathered sandstone, mudstone, or fine-grained volcanic rock

Possible fossilized shell or coral fragment

Indeterminate biogenic carbonate, likely calcite (CaCO₃)

Weathered shale or mudstone fragment

Fine-grained clastic sedimentary rock, likely shale or mudstone; exact identification is uncertain from the photo

Pumiceous volcanic rock (likely rhyolitic pumice/tuff)

Felsic volcanic glass and ash; commonly quartz–alkali feldspar–plagioclase composition

Fossilized Bone Chunk (likely Dinosaur or Large Mammal)

Permineralized Fossil Bone

Fossilized shell or bone fragment

Indeterminate biogenic carbonate/phosphate fossil; likely a fragment of fossil shell or small vertebrate bone

Greenstone

Metamorphosed Mafic Igneous Rock