Synthetic Or Natural Fiber

Tumbled pale-yellow quartz (likely citrine or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Amber (Sumatran / Indonesian Red Blue)

Succinum (Fossilized Tree Resin)

Yellow Quartz (or Citrine Quartz)

Silicon Dioxide (SiO2)

Tumbled jasper or chalcedony

Microcrystalline quartz (SiO₂), likely brown jasper/chalcedony

Tumbled quartz crystal

Quartz (silicon dioxide, SiO₂)

Tumbled green aventurine (probable)

Quartz, SiO₂, with fuchsite mica inclusions

Tumbled quartz-rich stone, likely druzy quartz or quartzite

Quartz (SiO₂), possibly quartzite with iron-oxide staining

Quartz (Citrine or Iron-Stained variety)

Silicon Dioxide (SiO2)

Rounded gray pebble, likely quartz-rich river stone

Probably quartzite or quartz-rich sandstone; exact identification requires testing

Fulgurite

Fulgurite (Lechatelierite-rich fused silica)

Tumbled granite or granitic gneiss

Granite, typically quartz + feldspar + mica; possibly foliated granitic gneiss

Quartz (Smoky or Impure Variety)

Silicon Dioxide (SiO2)

Tumbled milky quartz pebble

Quartz (SiO₂), likely milky quartz

Tumbled yellow-orange chalcedony (likely carnelian or jasper)

Microcrystalline quartz, SiO₂; iron-oxide coloration

Tumbled red jasper (probable)

Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides

Tumbled amber-colored quartz or chalcedony

Microcrystalline quartz (SiO₂), possibly iron-stained chalcedony

Polished orbicular jasper (likely ocean jasper)

Microcrystalline quartz (SiO₂) with iron oxides and accessory minerals

Tumbled rose quartz

Quartz, silicon dioxide (SiO₂), pink variety

Tumbled orange chalcedony / jasper

Microcrystalline quartz, SiO₂, likely iron-stained chalcedony or quartz-rich jasper

Tumbled amber-colored chalcedony or jasper

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper

Likely tumbled quartz/chalcedony

Quartz (SiO₂), possibly milky quartz or pale chalcedony

Tumbled rose quartz

Quartz, silicon dioxide (SiO₂), pink variety

Small quartz fragment, possibly milky quartz

Quartz (SiO₂)

Pearl

Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3

Peacock Ore

Bornite (Cu5FeS4) or Chalcopyrite treated with acid

Tumbled orange chalcedony or carnelian

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Yellow Quartz (Citrine/Yellow Jasper mix)

Silicon Dioxide (SiO2)

Quartz (specifically Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Gossan (Iron Hat)

Goethite-Hematite rich weathered rock (Fe-hydroxides)

Quartz (Gravel Pebble)

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine Quartz)

Silicon Dioxide (SiO2)

Tumbled chalcedony (likely milky quartz)

Microcrystalline quartz, SiO₂; possibly pale agate or quartzite

Tumbled white quartz

Quartz (silicon dioxide, SiO₂)

Tumbled turquoise-bearing rock

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O, likely in a host rock such as limonite or silica

Polished orange jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Tumbled brecciated jasper

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

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Yellow Quartz

Silicon Dioxide (SiO2)

Citrine

Silicon Dioxide (SiO2) with trace Iron

Polished agate (likely carnelian/mossy chalcedony)

Chalcedony, microcrystalline quartz (SiO₂), with iron-oxide banding and possible inclusions