Igneous

Likely weathered porphyritic igneous rock

Provisional identification: altered basaltic-andesite or rhyolite; exact mineralogy cannot be confirmed from this close, flash-lit image

Uncertain coarse-grained igneous fragment

Likely granite or granitic pegmatite; quartz–feldspar–mica assemblage

Likely porphyritic igneous rock (possibly granite or rhyolite)

Quartz–feldspar–mica aggregate; exact identification requires a fresh surface and tests

Possible dark igneous rock

Indeterminate; likely basalt or fine-grained mafic rock

Banded Igneous Dike Rock

Intrusive igneous rock with felsic/mafic banding

Porphyritic Igneous Rock / Basalt or Andesite Xenolith in Granite or Quartzite

Silicate rock with contrasting xenolith/inclusion

Pink granite (likely weathered or pegmatitic granite)

Granite; chiefly quartz (SiO₂), potassium feldspar, plagioclase, and minor biotite/hornblende

Diorite with Quartz Veins

Diorite

Basalt with Quartz Veins

Amygdaloidal Basalt (matrix) with Crystalline SiO2 (veins)

Quartz (Pegmatitic Quartz with Feldspar)

SiO2 (Silicon Dioxide)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Likely rough quartz with iron-oxide staining

Quartz (SiO₂), possibly with iron-oxide inclusions or surface staining

Magnetite (Loadstone candidate)

Iron(II,III) oxide (Fe3O4)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Pegmatite

Pegmatitic Granite containing Quartz, Feldspar, and Schorl

Granite Cobble

Granitoid

Banded Sandstone (Water-worn Pebble)

Arenite with mineral banding

Gabbro or Diorite with Felsic intrusion

Mafic to intermediate intrusive igneous rock with felsic vein/inclusion

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Quartz with Sulfide Inclusions

Silicon Dioxide (SiO2) with metallic mineral inclusions

Pyrite

Iron Sulfide (FeS2)

Quartz (Translucent/Rose variety)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Druzy Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Olivine (Peridot)

Magnesium Iron Silicate ((Mg, Fe)2SiO4)

Polished labradorite palm stone

Labradorite, a plagioclase feldspar in the labradorite–bytownite series; approximately (Ca,Na)(Al,Si)₄O₈

Milky quartz

Quartz (silicon dioxide, SiO₂)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Milky Quartz Pebble

Silicon dioxide (SiO2)

Quartz (Chalcedony/Agate)

Silicon Dioxide (SiO2)

Quartz with Inclusions

Silicon Dioxide (SiO2)

Galena

Lead Sulfide (PbS)

Tumbled Agate

Silicon dioxide (SiO2)

Epidote-bearing Rock

Epidote / Silicate mineral aggregate