Mineral

Black Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Mica schist

Schist dominated by muscovite/biotite mica, commonly with quartz and feldspar

Vesicular Basalt

Amygdaloidal Basalt (Mafic extrusive volcanic rock)

Chalcopyrite-bearing quartz vein rock

Quartz (SiO₂) with likely chalcopyrite (CuFeS₂) and dark host rock; exact identification is uncertain from the photo

Tumbled granite pebble

Granite, a coarse-grained felsic intrusive igneous rock

Fluorite

Calcium Fluoride (CaF2)

Amphibolite

Amphibolite, composed mainly of amphibole and plagioclase feldspar

Painted pebble, likely granite or granitic gneiss

Granite (quartz–feldspar–mica rock); exact identification is uncertain from the image

Quartz

Silicon Dioxide (SiO2)

Weathered basalt pebble

Basalt, a fine-grained mafic volcanic rock; likely containing plagioclase and pyroxene with weathering products

Greenstone pebble

Greenschist-facies mafic rock, commonly derived from basalt; likely rich in chlorite, actinolite, and epidote

Gravel

Unconsolidated rock fragments / detrital sediment

Granite

Intrusive Igneous Rock (Felsic)

Basalt with Vesicular Amygdule

Extrusive igneous rock (Mafic)

Yellow-brown stone or mineral fragment

Unidentified; the image does not show enough detail for a reliable identification

Small pale mineral fragment, possibly calcite

Unidentified; calcite (CaCO₃) is one possibility

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Limonite

FeO(OH)·nH2O

Blue-gray rough mineral specimen, possibly kyanite

Undetermined; kyanite is a possible identification (Al₂SiO₅)

Yellow Apatite

Fluorapatite (Ca5(PO4)3(F,Cl,OH))

Sandstone with Quartz/Calcite druse

Arenite with druse (SiO2 or CaCO3)

Serpentinite

Serpentine-group minerals, chiefly antigorite, lizardite, and chrysotile; approximate formula Mg3Si2O5(OH)4

Dark green-gray river-worn rock, likely serpentinite

Serpentinite (rock composed chiefly of serpentine-group minerals; identification is provisional from the photograph)

Dark gray shale or slate-like rock

Fine-grained, clay-rich mudrock; exact identification is uncertain from the photo

Fine-grained sedimentary rock, likely mudstone

Mudstone (clay- and silt-sized siliciclastic sedimentary rock)

Likely amphibolite

Amphibolite, composed mainly of hornblende and plagioclase feldspar

Granite

Coarse-grained felsic intrusive igneous rock, chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende

Granite (likely weathered granite or granitic gneiss)

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

Spinosaurus fossil (permineralized bone)

Spinosaurus aegyptiacus (Calcium phosphate mineralized with silica/sediment)

Gneiss

Gneiss

Rough Diamond (Bort)

Diamond (C)

Granite

Phaneritic Felsic Igneous Rock

Polished serpentine pebble

Serpentinite, chiefly serpentine-group minerals (chrysotile, lizardite, antigorite)

Serpentinite

Serpentinite, composed mainly of serpentine-group minerals (approximately Mg₃Si₂O₅(OH)₄)

Quartz-rich pegmatite with mica

Granitic pegmatite; mainly quartz (SiO₂), feldspar, and muscovite/biotite mica, with possible sulfide or iron-oxide staining

Diorite

Diorite (Phaneritic intermediate plutonic rock)

Diorite

Diorite (Intermediate intrusive igneous rock)

Gneiss

Gneiss (Metamorphic Rock)

Gneiss (Metamorphic Pebble)

Gneiss (SiO2-rich metamorphic rock)

Gneiss

Gneiss

Granite

Granite (Felsic Plutonic Rock)

Granodiorite

Granodiorite