Igneous And Metamorphic Derivative (Weathered)

Quartz-Tourmaline Pebble

Quartz with Tourmaline inclusions

Weathered quartz-rich rock fragment

Indeterminate; likely quartz-bearing granitoid or quartzite

Clear Quartz

Silicon Dioxide (SiO2)

Tumbled quartz-rich rock, possibly granite or quartzite

Quartz (SiO₂) with probable feldspar and mica; exact rock identification is uncertain from the image

Milky Quartz

Silicon Dioxide (SiO2)

Iron-stained quartz or quartzite pebble

Quartz (SiO₂), possibly quartzite with hematite/goethite staining

Likely quartz fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz or quartz-rich rock

Yellow Agate

Agate (Varietal form of Chalcedony/Quartz, SiO2)

Weathered greenish stone, possibly serpentinite or altered basalt

Tentatively serpentinite (mostly serpentine minerals) or chlorite-rich basalt; exact identification requires testing

Milky quartz

Quartz (silicon dioxide, SiO₂)

Weathered rock fragment, possibly granite or metamorphic stone

Indeterminate; likely quartz–feldspar–mica aggregate (granite-like), but image resolution prevents reliable identification

Quartz-rich rock fragment

Likely milky quartz (SiO₂), possibly a pale quartzite fragment

Quartz pebble

Silicon dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz pebble

SiO2

Likely quartz-bearing rock fragment

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

Weathered quartz-bearing metamorphic rock, likely mica schist or gneiss

Quartz–feldspar–mica assemblage; exact mineral identification requires testing

Schist

Mica Schist (Foliated Metamorphic Rock)

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Garnet (almandine or pyrope variety)

Silicate mineral Group: (Fe, Mg, Mn, Ca)3(Al, Fe, Cr)2(SiO4)3

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

Granitic Gneiss Pebble

Gneiss (felsic metamorphic rock)

Weathered quartz-bearing rock, possibly porphyritic rhyolite

Likely altered rhyolite or dacite containing quartz and feldspar; exact identification requires testing

Greenschist

Greenschist facies metamorphic rock

Weathered quartz-bearing rock, possibly calcite vein fragment

Indeterminate; likely quartz (SiO₂) with carbonate minerals such as calcite (CaCO₃)

Gneiss

Metamorphic Gneiss (High-grade regional metamorphism)

Weathered schist or gneiss

Quartz–feldspar–mica metamorphic rock

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2

Weathered quartz-rich pebble

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

Aventurine (likely Green Aventurine)

Silicon Dioxide (SiO2) with mineral inclusions

Feldspar-rich granitoid pebble

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

Feldspar (Plagioclase / Potassium Feldspar)

Feldspar Group (KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8)

Likely weathered brown quartz-bearing rock

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

Garnet Gneiss or Mica Schist with Garnet

Almandine Garnet-bearing Gneiss

Likely quartz-rich pebbles

Quartz (SiO₂), possibly milky quartz or quartzite; identification is uncertain from the blurry image

Quartz-rich rock, likely milky quartz with iron staining

Quartz (SiO₂), possibly quartzite or quartz vein material

White quartz pebble (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Blue apatite or dyed blue stone (likely apatite)

Apatite, Ca5(PO4)3(F,Cl,OH); exact identification is uncertain from the photograph

White Quartz Pebble

Silicon Dioxide (SiO2)

Mixed rock and mineral specimen collection

Mostly undetermined from the photograph; apparent quartz-rich rocks, sandstone, granite/gneiss, and possibly iron-oxide-bearing specimens

Small quartz-rich rock fragment (tentative)

Likely quartz (SiO₂) with possible feldspar or carbonate inclusions

Quartz-rich gravel fragment

Quartz (silicon dioxide, SiO₂), possibly with feldspar or carbonate inclusions