Sedimentary Or Igneous Fragment

Quartz (Crystal)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Conglomerate

Clastic sedimentary rock (Conglomerate)

Black basalt fragment

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

Dark basalt fragment

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

Pink Granite (Fragment)

Pink Granite (dominated by Potassium Feldspar: KAlSi3O8)

Chondrite Meteorite Fragment

Ordinary Chondrite (L or H type)

Raw Fluorite

Calcium Fluoride (CaF2)

Calcite

Calcite (calcium carbonate, CaCO₃), likely a massive crystalline specimen

Chert Concretion

Chert (Microcrystalline Quartz, SiO2)

Grey River Pebble (Greywacke / Basalt)

Stream-rounded silicate rock pebble

Milky Quartz

Silicon Dioxide (SiO2)

Concretion

Septarian concretion (likely containing Calcite or Siderite)

Cobblestones (Basalt/River Rock)

Polished lithic fragments and rounded pebbles

Quartz Pebble (on Granite)

Silicon Dioxide (SiO2)

Weathered porphyritic pebble

Likely porphyritic volcanic rock, possibly andesite or rhyolite

Granite with Mafic Xenolith

Intrusive Igneous Rock (Felsic to Intermediate)

Quartz-rich granitic pegmatite fragment

Pegmatite, composed mainly of quartz (SiO₂), feldspar, and mica

White quartz-rich pebble

Likely quartzite or milky-quartz pebble (SiO₂)

Weathered sandstone or granitic rock fragment

Likely quartz-rich sandstone; exact identification requires testing

Chert (Gravel Bit)

Microcrystalline silica (SiO2)

Ferromanganese Nodule

Polymetallic Nodule (composed primarily of MnO2 and Fe2O3)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Weathered limestone or calcareous fossil fragment

Calcite-rich carbonate rock (CaCO₃), possibly fossiliferous limestone

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2) with various iron-oxide inclusions

Agate (specifically Chalcedony/Banded Agate)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Likely basalt or scoria fragment

Dark mafic volcanic rock, most likely basalt (plagioclase–pyroxene–olivine) or vesicular scoria

Green Fluorite

Calcium Fluoride (CaF2)

Tumbled honey calcite (probable)

Calcite, calcium carbonate (CaCO₃)

Orange Calcite

Calcium Carbonate (CaCO3)

Granite (with Quartz fragment)

Intrusive Felsic Igneous Rock

Black Beauty Meteorite

NWA 7034 (Northwest Africa 7034)

Weathered granite or granitic gneiss

Granite; primarily quartz, feldspar, and mica (exact identification uncertain from the photo)

Vesicular basalt (probable)

Basalt, mainly plagioclase feldspar and pyroxene, with possible olivine and iron oxides

Quartz-rich breccia or altered granite fragment

Polymineralic quartz–feldspar rock, likely hydrothermally altered granite/pegmatite

Small dark volcanic rock, likely basalt

Basalt; chiefly plagioclase feldspar, clinopyroxene, and minor olivine or iron-titanium oxides

Selenite (gypsum crystal)

Gypsum, calcium sulfate dihydrate (CaSO₄·2H₂O), likely the variety selenite

Rounded iron-rich pebble

Likely hematite/goethite-bearing quartzite or ironstone; exact identification requires testing

Greenstone / Metagraywacke

Metamorphosed basaltic or sedimentary rock (Complex Silicate)