Metamorphic, Likely Sedimentary With Quartz Veins

Quartz Vein in Siltstone

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix

Mixed metamorphic rock fragments, likely garnet-bearing schist and quartzite

Quartz–feldspar–mica schist/quartzite; red grains may be almandine garnet

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Iron-stained quartz-rich rock, possibly jasperized quartz or quartzite

Mostly SiO₂ quartz with iron oxides/hydroxides (hematite, goethite) and possible clay or feldspar impurities

Likely polished gray quartzite or chert

Quartzite, predominantly microcrystalline SiO₂; possibly gray chert (chalcedony/quartz)

White quartz fragment

Quartz (silicon dioxide, SiO₂)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Tumbled quartz pebble

Quartz (silicon dioxide, SiO₂), probably milky or iron-stained quartz

Likely pyrite-bearing rock

Pyrite (FeS₂), possibly in a quartz- or iron-oxide-rich matrix

Veined Pebble (likely a Quartz-Veined Pebble)

Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)

Tumbled quartz (likely milky quartz)

Quartz — silicon dioxide, SiO₂

Raw quartz fragment

Quartz (SiO₂), likely milky or included quartz

Weathered schist or gneiss fragment

Quartz–feldspar–mica metamorphic rock; likely mica schist or gneiss

Rounded weathered pebble, likely chert or fine-grained quartzite

Microcrystalline quartz (SiO₂), probable chert; quartzite is an alternative

Likely polished quartz or quartz-rich pebble

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Clear quartz crystal (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

Quartz-veined metamorphic cobble

Likely quartzite or quartz-rich metasedimentary rock; veins predominantly quartz (SiO₂)

Weathered quartz-rich rock, possibly quartzite or altered granite

Quartz-dominant silicate rock; exact identification requires a fresh surface and tests

Tumbled quartz (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Mixed mineral and gemstone specimens

Likely amethyst (quartz), malachite, blue calcite or dyed chalcedony, red jasper, and green aventurine/serpentine

Likely slate or fine-grained metamorphic stone with quartz vein

Slate–phyllite, composed mainly of quartz, mica, and chlorite; the white vein is likely quartz

Weathered quartz-rich pebble (tentative)

Likely quartz/chalcedony, SiO₂, possibly iron-stained

Gneiss with Quartz Veining

Gneiss (High-grade Regional Metamorphic Rock)

Calcite

Calcite (CaCO₃), likely crystalline limestone or marble fragment

Quartz vein in weathered host rock

Milky quartz (SiO₂), likely in a feldspathic or carbonate-rich matrix

Quartzite (with Quartz Veining)

Quartzite (SiO2)

Pyrite-bearing metamorphic rock (likely schist or quartzite)

Pyrite (FeS₂) in a quartz-rich host rock, possibly mica schist

Rounded quartz-rich pebble

Quartz-bearing lithic clast; exact rock type indeterminate from image

Tumbled quartz (likely milky or included quartz)

Quartz, silicon dioxide (SiO₂)

White quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂); possibly quartzite, a metamorphosed quartz sandstone

Quartz (Milk/Citrine variety)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Rough white calcite

Calcite (calcium carbonate, CaCO₃)

Veined quartz-bearing metamorphic rock

Likely quartzite or quartz-veined hornfels; exact identification requires a fresh surface and tests

Iron-stained quartz pebble

Quartz (SiO₂), likely microcrystalline or massive quartz with goethite/limonite staining

Pyrite-bearing metamorphic rock (likely pyrite schist or quartz–pyrite ore)

Pyrite (FeS₂) in a quartz–mica-rich matrix; exact host rock is uncertain from the image

White quartz pebble

Quartz (silicon dioxide, SiO₂)

Mixed mineral and rock collection

Predominantly quartz varieties, including amethyst, plus likely calcite, feldspar, mica, and miscellaneous polished stones

Tiny rounded metallic-looking pebble, possibly pyrite or a metal-rich mineral

Uncertain from image; possible pyrite (FeS₂), chalcopyrite (CuFeS₂), or magnetite (Fe₃O₄)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz vein specimen

Quartz (SiO₂), likely drusy or massive quartz on host rock