Mineral, Part Of A Rock

Small pale stone, likely quartzite or limestone fragment

Indeterminate; possible quartzite (mostly SiO₂) or calcitic limestone (CaCO₃)

Pink Granite

Phaneritic Plutonic Felsic Igneous Rock (Quartz, K-Feldspar, Plagioclase)

Rounded river pebble, likely weathered sandstone or siltstone

Indeterminate clastic sedimentary rock; likely quartz-rich sandstone/siltstone

Quartzite (River Pebble)

Quartzite (SiO2)

Gold Ore in Matrix

Native Gold (Au) in Quartz/Limonite host rock

Quartz (Gravel fragment)

Quartz (Silicon Dioxide, SiO2)

Likely quartz-bearing rock fragment

Quartz (SiO₂), possibly in a weathered granitoid or metamorphic matrix

Basalt with Plagioclase Feldspar

Basalt (mafic extrusive igneous rock) with plagioclase feldspar phenocrysts

Chromite

Chromite (FeCr2O4)

Tumbled basalt pebble

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

Vesicular Basalt (Scoria)

Extrusive Mafic Volcanic Rock (FeO-SiO2-MgO)

Weathered granitic pebble

Likely granite or granodiorite, composed mainly of quartz, feldspar, and mica/amphibole

Weathered quartz-rich pebble

Likely quartzite or granitic/granodioritic rock; exact identification is uncertain from the image

Granite

Phaneritic Plutonic Felsic Rock (KAlSi3O8 + SiO2 + NaAlSi3O8)

Painted Garden Rock (likely Granite or Limestone base)

Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments

Peridotite (Olivine)

Peridotite (comprising (Mg,Fe)2SiO4)

Labradorite

Labradorite ((Ca,Na)(Al,Si)4O8)

Granite

Phaneritic Intrusive Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)

Basalt River Stone

Basalt (Aphanitic Mafic Volcanic Rock)

Likely weathered brown quartz-bearing rock

Tentatively weathered granite or granitic gneiss; exact identification is uncertain from the photograph

Labradorite

Labradorite (Ca,Na)(Al,Si)4O8

Rounded brown pebble, likely weathered basalt or lateritic rock

Probable fine-grained basalt; exact identification uncertain from the photograph

Basalt (Polished)

Basalt (Mafic Extrusive Igneous Rock)

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Granite

Granodiorite / Granite (Phaneritic Igneous Rock)

Quartz / Quartzite

Silicon Dioxide (SiO2)

Bronzite

MgSiO3 (Enstatite with 10-30% FeSiO3 in solid solution)

Black basalt pebble

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine

Peach Moonstone

Potassium Aluminum Silicate (KAlSi3O8)

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)

Granite Pebble

Granitoid (Quartz-Feldspar dominant rock)

Likely feldspar-rich granite fragment

Granite, composed mainly of potassium feldspar, plagioclase, and quartz

Grey River Stone (Quartz-rich Quartzite/Siltstone)

Quartzite / Meta-siltstone (primarily SiO2)

Druzy Quartz on Quartz Base

Silicon Dioxide (SiO2)

Basalt (with Porphyritic Texture)

Basalt

Likely slate fragments

Slate, a fine-grained metamorphic rock composed chiefly of quartz, mica, and chlorite

Granite

Granite (Felsic Plutonic Rock)

Granite

Granite (Phaneritic Igneous Rock)

Weathered fossil shell fragment

Likely a fossilized bivalve or gastropod fragment; exact taxon cannot be determined from one view

Lepidolite

Lepidolite - K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Granite

Granite

Milky or Greenish Quartz Pebble

Silicon Dioxide (SiO2)