Metamorphic (Likely Gneiss Or Schist Based On Texture)

Possible tektite or dark volcanic rock fragment

Uncertain; likely natural silicate glass (tektite) or basalt

Basalt River Stone

Basalt (Mafic volcanic rock)

Granite Pebble

Intrusive Felsic Igneous Rock (primarily SiO2 with Al2O3, K2O, Na2O)

Pegmatitic quartz–feldspar rock with dark mica

Granitic pegmatite; quartz (SiO₂), feldspar, and biotite mica

Pink Granite

Phaneritic Plutonic Felsic Rock (Granite)

Fossiliferous Limestone (Crinoidal)

Bioclastic Limestone (predominantly CaCO3)

Weathered sandstone

Quartz-rich clastic sandstone, likely iron-oxide-stained

Chakra Stone Bracelet (mixed gemstones)

Multi-mineral/Gemstone assembly (primarily Quartz variety beads)

Sandstone (Calcareous Sandstone)

Calcareous Sandstone (primarily SiO2 with CaCO3 cement)

Obsidian

Obsidian (Volcanic Glass, SiO2 + oxide impurities)

Tumbled serpentine with dark magnetite/chromite matrix

Serpentinite; chiefly antigorite/lizardite, Mg3Si2O5(OH)4, with magnetite and possibly chromite

Serpentinite

Serpentinite (Mg ₃ Si ₂ O ₅ (OH) ₄)

Goldstone (Red)

Aventurine Glass (Cupriferous glass)

Polished granite

Granite; chiefly quartz, feldspar, and mica/amphibole

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Dark rounded pebble, likely basalt or volcanic rock

Fine-grained mafic igneous rock; possibly basalt (composition chiefly plagioclase and pyroxene)

Quartzite

Quartzite (principally SiO2)

Quartzite

Quartzite (primarily SiO2)

Citrine (Heat-treated Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Sandstone

Arenite (primarily SiO2)

Rhodonite

Rhodonite (Manganese silicate), (Mn,Fe,Mg,Ca)SiO3

Breccia Pebble

Sedimentary Breccia

Basalt (Weathered River Stone)

Basalt (SiO2 concentration approx. 45-52%)

Weathered quartz-bearing sandstone

Quartz arenite or feldspathic sandstone (tentative)

Sandstone

Arenite (mainly SiO2 with varying cements)

Basalt with Quartz Veins

Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene) with SiO2 inclusions

Amazonite

Microcline (variety Amazonite) - K(AlSi3O8)

Tumbled brown pebble

Indeterminate; likely quartz-rich sandstone or chert

Likely weathered iron-rich stone

Uncertain; possibly limonite/goethite-bearing rock

Likely weathered sandstone fragment

Sandstone, chiefly quartz (SiO₂) with feldspar and iron-oxide cement

Tumbled pink granite or feldspar-rich granitic pebble

Granite, composed mainly of quartz, potassium feldspar, and plagioclase; exact identification is uncertain from the image

Weathered granite-like rock

Coarse-grained granitic rock, likely quartz–feldspar–mica aggregate

Weathered sandstone or quartz-rich sedimentary pebble

Indeterminate lithic fragment; likely quartz arenite (sandstone)

Andesite Porphyry

Porphyritic Andesite (Intermediate volcanic rock)

Epidote

Calcium aluminum iron silicate (Ca2(Al, Fe)3(SiO4)3(OH))

Amazonite

Lead-bearing Microcline (KAlSi3O8)

Quartz-rich pegmatite (possibly quartz–feldspar rock)

Granite pegmatite; chiefly quartz (SiO₂) with feldspar and minor mica/iron staining

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz with Host Rock

Silicon Dioxide (SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)