Igneous And Metamorphic Derivative (Weathered)

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz-rich pegmatite fragment

Pegmatite composed chiefly of quartz (SiO₂), with probable feldspar and mica inclusions

Milky and Ferruginous Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Weathered fossil shell fragment

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

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Quartz Boulder

Silicon Dioxide (SiO2)

Probable tumbled garnet

Garnet-group silicate, commonly almandine (Fe₃Al₂Si₃O₁₂)

Moonstone (with Tourmaline/Mica)

Orthoclase/Albite Feldspar (KAlSi3O8 / NaAlSi3O8)

Quartz (Milky/Crystalline variety)

Silicon Dioxide (SiO2)

Tumbled quartz-rich pebble

Milky quartz with possible feldspar or mica inclusions (SiO₂-dominant)

Rounded river cobbles, likely quartzite and weathered granite

Quartzite (SiO₂) with possible granitic and sandstone companions

Quartz-bearing rock or quartz-rich mineral specimen

Quartz, silicon dioxide (SiO₂); exact host rock is uncertain from the image

Tumbled milky quartz

Quartz (SiO₂), likely translucent white variety

Likely quartz-rich river pebble

Milky quartz or quartz-bearing granitic/gneissic fragment (SiO₂-dominant)

Granite or granitic gneiss fragment

Granite: quartz + feldspar + mica; possibly weathered granitic gneiss

Greenstone

Metabasalt

River Cobble (Gneiss/Migmatite)

Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)

Milky quartz (possibly chalcedony-bearing quartz)

Quartz, silicon dioxide (SiO₂)

Weathered iron-rich rock, possibly limonite/goethite-bearing breccia

Hydrated iron oxides/hydroxides, mainly limonite (mixture) and goethite, FeO(OH)·nH₂O

Likely weathered quartz-rich rock fragment

Uncertain; possibly granitic pegmatite or quartz-bearing metamorphic rock

Weathered granitic or gneissic pebble

Granite–gneiss assemblage; quartz + feldspar + dark mafic minerals

Likely weathered granite or granitic gneiss fragment

Granite: quartz + feldspar + mica; possibly gneiss if foliation is confirmed

Weathered basalt or iron-rich river cobble

Basalt, likely with iron-oxide staining; exact identification requires testing

Mixed river stones and gravel

Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Quartz pebble (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Quartz (Smoky/Rose Quartz Pebble)

Silicon Dioxide (SiO2)

Likely basaltic river cobble

Fine- to medium-grained mafic igneous rock, commonly basalt (plagioclase–pyroxene ± olivine)

Quartz crystal fragment

Quartz (SiO₂), likely a small clear-to-gray crystal fragment

Quartz-rich vein fragment, possibly quartz with mica or calcite

Quartz (SiO₂), with probable muscovite/biotite mica and minor feldspar or calcite

White quartz pebble

Quartz (silicon dioxide, SiO₂)

Milky quartz (quartz-rich rock fragment)

Quartz, silicon dioxide (SiO₂)

Garnet

Almandine (Fe3Al2(SiO4)3)

Weathered granite or granitic gneiss

Granite; primarily quartz (SiO₂), feldspar, and mica, possibly with metamorphic foliation

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Granite (Gneissic / Weathered Pebble)

Felsic intrusive igneous rock (Granite)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Rounded gray-green beach pebble

Likely basalt or fine-grained volcanic rock; exact identification requires testing

Quartz fragment

Quartz (silicon dioxide, SiO₂), likely milky or smoky quartz

Pyrite

Iron Sulfide (FeS2)