Igneous And Metamorphic Derivative (Weathered)

Quartz pebble

Silicon dioxide (SiO2)

Specular Hematite

Hematite (Fe2O3)

Quartz Sand Gravel

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Quartz (Milky/Crystal variety)

Silicon Dioxide (SiO2)

Small white quartz fragment

Quartz (silicon dioxide, SiO₂)

Quartz crystal (likely milky or cloudy quartz)

Quartz, silicon dioxide (SiO₂)

Rounded quartz-rich river pebbles

Alluvial gravel; commonly quartzite, chert, and quartz-bearing sandstone fragments

Weathered iron-rich rock fragment

Likely limonite/goethite-bearing rock, possibly altered pyrite or mica schist

Quartz Pebble

Silicon Dioxide (SiO2)

Rounded white pebble, likely quartz or feldspar

Most consistent with milky quartz (SiO₂), though altered feldspar or calcite is possible from the image

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Small quartz-rich rock fragment

Likely quartz-bearing feldspathic rock; exact identification is limited by the image

Mixed rounded rock pebbles

Likely granitic gneiss, basaltic rock, and quartz-rich granitic material; exact identification is uncertain from the image

Purple quartz-bearing rock, likely amethyst-bearing quartzite or pegmatitic quartz

Quartz (SiO₂), with iron-related purple coloration; possible feldspar and mica impurities

Gneiss (specifically a weathered or stream-worn specimen)

Gneiss (Foliated Metamorphic Rock)

Gneiss

Gneiss (Foliated Metamorphic Rock)

Quartz

Silicon Dioxide (SiO2)

Quartz-rich stone, likely milky quartz

Quartz (silicon dioxide, SiO₂), possibly iron-stained or feldspar-bearing

Quartz (massive milky quartz)

Quartz, silicon dioxide (SiO₂)

Quartz-rich rock, possibly quartz vein material

Likely milky quartz with iron-stained or weathered host rock; exact identification is uncertain from the photo

Moonstone

Orthoclase (KAlSi3O8) or Oligoclase with adularescence

Weathered quartz-rich metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica gneiss/schist (tentative; image resolution limits certainty)

Weathered basalt or mafic metavolcanic rock

Basalt, possibly altered to greenstone (chlorite–epidote–actinolite assemblage)

Weathered mafic metamorphic rock, likely serpentinite or altered basalt

Probably serpentinized ultramafic rock; commonly dominated by serpentine-group minerals, with magnetite and altered pyroxene/olivine

Weathered gneissic rock

Biotite–quartz–feldspar gneiss, possibly migmatitic

Quartz-rich gneiss

Foliated quartz–feldspar–mica gneiss, possibly migmatitic

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Tumbled milky quartz pebble

Quartz, silicon dioxide (SiO₂), microcrystalline to coarsely crystalline variety

Milky quartz (rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

River Quartz Pitting/Cobble

Silicon Dioxide (SiO2)

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Mixed rounded river pebbles, likely basalt and granite

Basalt (fine-grained mafic rock) and granite/granitoid (quartz–feldspar rock)

Polished river pebble, likely granite or granitic gneiss

Quartz–feldspar–mica aggregate; possibly biotite granite (compositionally near granite)

Quartz-rich pegmatite (likely feldspar–quartz rock)

Granitic pegmatite; predominantly quartz (SiO₂) and feldspar, with possible mica and iron-oxide staining

Milky quartz (rough quartz fragment)

Quartz, silicon dioxide (SiO₂)

Weathered quartz-rich pebble (tentative)

Likely quartz/chalcedony, SiO₂, possibly iron-stained

Milky quartz

Quartz (silicon dioxide, SiO₂)

Garnet

Almandine (Fe3Al2(SiO4)3)

Quartz (Water-worn Pebble)

Silicon Dioxide (SiO2)