This Is Not A Rock Or Mineral

Rounded quartz-rich pebble

Lithic pebble; likely quartz/quartzite with iron-oxide staining

Quartz with Mica

Silicon Dioxide (SiO2) with Mica group inclusions

Banded Greywacke

Greywacke (Lithic wacke)

Granite

Plutonic felsic rock (Quartz, Feldspar, Mica)

Gneiss

High-grade regional metamorphic rock (Foliated)

Granite

Intrusive igneous rock

Ironstone Concretion (Moqui Marble / Boji Stone)

Sedimentary Iron Oxide Concretion (Fe2O3 / FeO(OH))

Granite (weathered, possibly porphyritic)

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

Sandstone

Arenite

Small brown mineral fragment

Unidentified; the image lacks enough detail for a reliable species-level identification

Pyrite-bearing Rock / Pyrite Ore

Iron Sulfide (FeS2) in host rock matrix

Agate (Common Chalcedony)

Silicon Dioxide (SiO2)

Small polished or naturally worn stone, possibly quartz-bearing rock

Indeterminate from the blurred image; likely quartz (SiO₂) or a pale feldspar-rich fragment

Granite

Intrusive Igneous Rock

Likely quartz-rich granite or granitic pegmatite

Granite, composed chiefly of quartz (SiO₂), feldspar, and mica; identification from the image is approximate

Likely gneiss

Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole

Quartz (Druzy on Matrix)

Silicon Dioxide (SiO2)

Likely weathered gneiss

Foliated metamorphic rock, commonly quartz–feldspar–mica gneiss

Plume Agate or Moss Agate

Agate (SiO2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Greenstone

Protolith: Basaltic rock

Slate with Quartz Vein

Foliated Metamorphic Rock (Mainly Quartz, Muscovite, Chlorite)

Quartz vein in weathered host rock

Quartz (SiO₂), likely in a weathered metamorphic or igneous matrix

Polished greenstone pebble

Likely serpentinite or chlorite-rich greenschist

Gneiss (Pebble)

Gneiss

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

Granite

Felsic intrusive igneous rock

Coal (Bituminous / Anthracite)

Organic Sedimentary Rock (Carbonaceous Rock)

Iron-stained brown mineral/rock fragment

Most likely limonite/goethite-rich material (hydrated iron oxides), possibly weathered ironstone; exact identification requires testing

Foliated Metamorphic Rock (likely Gneiss or Schist)

Gneissic Metamorphic Rock

Granite

Intrusive Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)

Sandstone Pebble / Quartzite Pebble

SiO2 (Silicon Dioxide enriched sedimentary rock)

Red Sandstone

Arenite (SiO2 with Fe2O3)

Granite

Felsic intrusive igneous rock

Gneiss

Gneiss (Metamorphic rock)

Quartz-bearing rock fragment

Likely quartz with iron-oxide staining; exact rock type cannot be determined from the image

Vesicular Basalt (or Scoraceous Basalt)

Basalt (Vesicular texture)

Granite

Intrusive Igneous Rock (Felsic)

Milky Quartz

Silicon Dioxide (SiO2)

Polished jasper or chert

Microcrystalline quartz (SiO₂), likely iron-stained jasper/chalcedony

Banded gneiss

Foliated gneiss, likely quartz–feldspar–mica gneiss

Sandstone

Clastic sedimentary rock