Igneous And Metamorphic Derivative (Weathered)

Greenstone

Metabasalt / Chlorite-actinolite-epidote schist

Smoky Quartz (with possible Feldspar inclusions)

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Iron-Stained)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Grit)

Silicon Dioxide (SiO2)

Quartz Vein Rock

Silicon Dioxide (SiO2)

River Pebble Quartzite / Granite Cobble

Quartz-rich Granitic / Quartzite Cobble

Weathered quartz-rich rock fragment

Likely quartz-bearing feldspathic rock; exact identification requires testing

Mica Sand / Vermiculite

Phyllosilicate group (typically Biotite or Muscovite)

Quartz Pebble (often referred to as 'Sea Glass' or 'River Stone' when worn smooth)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz with Iron Oxide Weathering

Silicon Dioxide (SiO2) with Goethite/Limonite coatings

Pyrite

Iron Sulfide (FeS2)

Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Weathered foliated metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica metamorphic rock; exact identification requires a fresh surface and mineral tests

Small rounded pebble, likely quartz-rich river stone

Indeterminate; likely quartz/chert-bearing lithic clast

Sand Grain (Silica/Quartz Grain)

Silicon Dioxide (SiO2)

Granitic Gneiss

Gneiss (High-grade regional metamorphic rock)

Weathered foliated metamorphic rock, likely schist or gneiss

Micaceous schist/gneiss; composition likely quartz, feldspar, mica, and altered mafic minerals

Bull Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Unidentified gray stone

Likely quartz-rich stone; exact identification is not possible from the image

Auriferous Quartz (Gold-bearing Quartz)

Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides

Weathered gray-green pebble

Indeterminate; possibly altered basalt, serpentinite, or a greenish metamorphic rock

Likely weathered gneiss or mica-rich schist

Foliated metamorphic rock, probably quartz–feldspar–biotite gneiss/schist

Weathered, quartz-rich metamorphic rock (likely schist or gneiss)

Quartz–feldspar–mica schist/gneiss, with surface lichens and iron-oxide staining

Likely weathered quartz-bearing rock (uncertain identification)

Possibly quartz-rich granite or granitic aplite; exact identification requires a clearer, larger image and tests

Mica Schist

Metamorphic rock predominantly composed of muscovite or biotite with quartz and feldspar

Greenstone

Metabasalt (composed of chlorite, epidote, and actinolite)

Tumbled Clear Quartz/Rock Crystal

Silicon Dioxide (SiO2)

Bornite

Copper Iron Sulfide (Cu5FeS4)

Rounded quartz-rich beach pebble

Likely milky quartz or quartzite (SiO₂)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Crystalline Silica (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Small brown mineral fragment, possibly quartz/chert

Uncertain; likely microcrystalline quartz (SiO₂) or a weathered silicate rock

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Smoky/Granular variety)

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)