Metamorphic, Likely Sedimentary With Quartz Veins

Banded Gneiss (with Quartz Vein)

Gneiss (SiO2 and varied Silicates)

Banded quartzite pebble

Quartzite, predominantly microcrystalline quartz (SiO₂), with a pale quartz vein or relict sedimentary band

Quartzite pebble

Quartzite (SiO2)

Pyrite-bearing rock (likely pyrite in quartz or altered host rock)

Pyrite, FeS₂, intergrown with quartz and/or iron-rich matrix

Quartz-rich breccia or quartzite with iron-oxide veining

Microcrystalline to granular SiO₂ (quartz), with hematite/goethite and minor feldspar or mica

Polished brecciated jasper (likely ocean jasper or orbicular jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral inclusions

Likely clear quartz fragment

Quartz (silicon dioxide, SiO₂)

Milky quartz

Quartz (SiO₂)

Quartz crystal fragment in weathered host rock

Quartz (SiO₂), possibly in a feldspathic or iron-stained matrix

Tumbled quartz-rich pebble, possibly milky quartz or quartzite

Quartz (SiO₂), potentially quartzite if metamorphically recrystallized

Quartz-rich pegmatite with green epidote or chlorite

Pegmatitic quartz–feldspar rock, likely containing epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH)) and/or chlorite

Weathered sulfide-bearing metamorphic rock (likely pyrite- or chalcopyrite-rich schist)

Quartz–mica schist with iron sulfides; possible pyrite (FeS₂) and chalcopyrite (CuFeS₂)

Likely milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Quartz-veined altered rock

Likely quartz-bearing metasediment or altered igneous rock; vein mineral: quartz (SiO₂)

Small white quartz fragment

Quartz (silicon dioxide, SiO₂)

Weathered quartz-rich pebble, likely sandstone or quartzite

Quartzite (SiO₂), possibly ferruginous sandstone

Quartz

Silicon dioxide (SiO2)

Gneiss with Quartz Vein

Gneiss (containing SiO2 vein)

Quartz (Milky/Smoky variety on matrix)

Silicon Dioxide (SiO2)

Iron-oxide-stained quartz-rich rock (possibly quartz vein material)

Likely quartz (SiO₂) with iron-oxide/hydroxide staining; exact rock type cannot be determined from the image alone

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Blue beach pebble, likely milky quartz or quartz-rich stone

Quartz (SiO₂), possibly a quartz-rich pebble; identification is tentative from the image

Banded quartzite pebble

Quartzite, predominantly crystalline quartz (SiO₂), with darker accessory minerals

Weathered quartz-rich rock, possibly quartzite or quartz vein material

Quartz (SiO₂), likely with feldspar, mica, and iron-oxide staining

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Rose Quartz or Jasper variety)

Silicon Dioxide (SiO2)

Metallic sulfide-bearing ore, likely pyrite-rich rock

Pyrite (FeS₂), possibly mixed with quartz or other sulfides

Veined slate or phyllite pebble

Metamorphosed shale; commonly slate (fine-grained phyllosilicates, quartz, and carbonate veins)

Quartz vein in host rock

Milky quartz (SiO₂), likely in a metamorphic host such as schist or gneiss

Pyrite-bearing quartz vein (likely pyrite ore)

Pyrite, FeS₂, with abundant quartz (SiO₂) and possibly chalcopyrite

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Quartz (likely tumbled or naturally water-worn)

Quartz (SiO₂ - Silicon Dioxide)

Banded gneiss (likely migmatitic gneiss)

Gneiss; quartz–feldspar–mica metamorphic rock, locally approaching migmatite

Polished pietersite-like brecciated jasper

Silicified chalcedony/jasper aggregate, primarily SiO₂; exact material uncertain from image

Quartz-rich river pebble, possibly weathered quartzite

Quartzite; predominantly crystalline SiO₂, though exact identification is uncertain from the photograph

Quartz-bearing metamorphic rock (likely quartz vein in schist or altered granite)

Quartz (SiO₂) in a mica-rich host rock; exact identification requires testing

White quartz fragment (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Quartz-rich rock, likely milky quartz vein material

Quartz (SiO₂), possibly quartzite or quartz-bearing pegmatite

Veined quartz-bearing metamorphic rock

Likely quartzite or siliceous schist with iron-oxide staining

Milky quartz fragment

Quartz, silicon dioxide (SiO₂)