Man Made Material, Not A Natural Rock Or Mineral Specimen

Tumbled basalt (probable)

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase and pyroxene, commonly with olivine and iron oxides

Rounded brown river pebble

Likely weathered sandstone or iron-stained quartz-rich rock; exact identification requires testing

Light-colored rounded pebble (possibly quartzite)

Unidentified siliceous rock; quartzite is a plausible but unconfirmed identification

Sandstone

Arenite (SiO2 primarily)

Aura Quartz (Anomalously Coated Quartz)

Silicon Dioxide (SiO2) treated with vaporized metals

Sea glass (likely pale blue glass)

Human-made silicate glass, likely soda-lime glass; not a natural mineral or rock

Possible weathered iron-rich rock or slag fragment

Indeterminate; likely limonite/goethite-bearing material, possibly iron slag

Turquoise-bead jewelry

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; the beads may be natural turquoise or a stabilized/imitation material

Goldstone (Brown)

Aventurine glass

Diamond (or Cubic Zirconia simulant)

Carbon (C) - Diamond / Zirconium dioxide (ZrO2) - CZ

Asphalt Chunk (with aggregate)

Bituminous concrete / Anthropogenic conglomerate

Yellow quartz fragment (likely citrine or iron-stained quartz)

Quartz, silicon dioxide (SiO₂), trigonal crystal system

Small weathered mineral/rock fragment

Unidentified; likely quartz-rich material, possibly quartzite or feldspar-bearing rock

Blue-gray mineral/rock fragment

Indeterminate; possibly azurite-bearing material, blue chalcedony, or dyed/coated stone

Natural turquoise-bearing rock

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O, likely in a limonite or host-rock matrix

Weathered quartz-rich rock, possibly granite or quartzite

Likely quartz–feldspar aggregate; precise identification requires testing

Pink chalcedony / quartz fragment (probable)

Microcrystalline quartz, SiO₂ (likely iron-stained chalcedony or quartzite)

Possibly polished black tourmaline (small cut stone)

Tourmaline-group mineral, likely schorl; complex borosilicate, approximately NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Pink-and-white quartz-rich pebble

Quartz (SiO₂), likely massive quartz with iron-oxide staining and possible feldspar inclusions

Tumbled green aventurine (probable), with blue-gray tumbled stones

Aventurine quartz, SiO₂ with fuchsite or other mica inclusions; blue stones may be sodalite or dyed quartz

Rounded gray-brown rock, possibly quartz-rich metamorphic rock

Undetermined; appearance is consistent with quartzite or a quartz-rich gneiss

Tumbled iron-rich stone, possibly jasper or weathered basalt

Indeterminate; likely iron-stained microcrystalline quartz (jasper) or altered basalt

Loose faceted colorless gemstones, likely quartz or glass-like mineral chips

Most consistent with quartz (SiO₂), though the photograph cannot exclude synthetic cubic zirconia or glass

Tumbled blue stone, likely blue calcite or dyed stone

Probably calcite (CaCO₃); exact identification is uncertain from the blurred image

Sea Glass (specifically Frosted White)

Amorphous Silica (substance: Sodium-calcium silicate glass)

Tumbled milky chalcedony (likely common opal or quartz-rich chalcedony)

Chalcedony, microcrystalline SiO₂; identification is uncertain from the photo

Druzy agate/geode (likely seam agate with quartz)

Microcrystalline quartz (chalcedony), SiO₂, with crystalline quartz druse and iron-oxide matrix

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (primarily SiO2)

White pebbles (rock material not identifiable from the image)

Undetermined; the smooth, pale pieces could be quartz, quartzite, or another light-colored rock

Polished agate slice

Agate, a banded variety of chalcedony (microcrystalline SiO₂)

Sea Glass

Amorphous silicon dioxide (Man-made glass weathered by nature)

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2)

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Tumbled blue glassy mineral specimen, possibly blue calcite or dyed quartz

Uncertain from image; likely calcite (CaCO₃) or dyed microcrystalline quartz (SiO₂)

Slag Glass (Cullet)

Amorphous Silica (man-made), primarily SiO2 with trace metal oxides

Vesicular Basalt / Scoria pebble

Extrusive igneous rock with amygdaloidal infilling

Mixed tumbled gemstone and mineral lot

Primarily quartz varieties (SiO₂), feldspar, beryl/chalcedony, and other unidentified silicate minerals

White quartz bead bracelet (likely milky quartz)

Quartz, silicon dioxide (SiO₂), usually microcrystalline or cloudy crystalline quartz

Small metallic-gold mineral fragment, possibly pyrite

Pyrite (FeS₂), if confirmed

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Tumbled quartz-rich pebble

Likely milky quartz with a dark mafic inclusion or attached basalt; exact identification requires testing

Rounded granite pebble

Granite, chiefly quartz, feldspar, and mica/amphibole