Synthetic Or Natural Fiber

Serpentine-rich metamorphic stone

Serpentinite, chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile) with possible quartz, magnesite, and magnetite

Polished red jasper (likely brecciated jasper)

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

Granite with Cupules / Bedrock Mortars

Granite (felsic intrusive plutonic rock)

Chert (often called Flint)

Chert (Microcrystalline Quartz, SiO2)

Pearl

Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3

Citrine Quartz / Iron-stained Quartz

Silicon Dioxide (SiO2)

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

Citrine Quartz

Silicon Dioxide (SiO2)

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Tumbled quartz (likely milky/rose quartz)

Quartz, silicon dioxide (SiO₂)

Red Jasper

Silicon Dioxide with iron impurities (Quartz variety, SiO2)

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Amethyst

Amethyst (Silicon Dioxide, SiO2 with Iron impurities)

Tumbled yellow-brown quartz/chert fragment

Microcrystalline quartz (SiO₂), possibly jasper or chalcedony

Tumbled greenish-gray stone, likely serpentinite or altered basalt

Probable serpentinite (serpentine-group minerals), possibly chlorite-/epidote-bearing basalt

Tumbled greenstone (likely serpentinite or green jasper)

Serpentinite, commonly dominated by serpentine-group minerals (Mg₃Si₂O₅(OH)₄); exact identification requires testing

Tumbled serpentine-rich rock

Serpentinite, likely antigorite/lizardite with magnetite and minor carbonates

Tumbled granite (likely biotite granite)

Granite: quartz + feldspar + biotite/hornblende

Tumbled quartz (likely milky quartz)

Quartz — silicon dioxide, SiO₂

Yellow Quartz (Citrine-colored Quartz Pebble)

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine-colored Quartz)

Silicon Dioxide (SiO2)

Polished/tumbled rhodonite-rich stone

Rhodonite (MnSiO₃), likely mixed with quartz and manganese oxides

Tumbled yellow quartz-rich stone, likely yellow jasper or quartzite

Jasper/quartzite; mainly microcrystalline quartz (SiO₂), with iron-oxide staining

Tumbled orange chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; iron-bearing variety commonly termed carnelian

Tumbled basalt (likely)

Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, often with minor olivine and iron oxides

Small tumbled dark stone, possibly basalt or slag

Likely fine-grained basalt; exact identification is uncertain from the photograph

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Raw Citrine

Citrine (Silicon Dioxide - SiO2)

Pearl (Pendant)

Calcium Carbonate (Aragonite/Calcite) - CaCO3

Turquoise in Matrix

Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)

Star Ruby

Corundum (Al2O3 with chromium and rutile inclusions)

Banded Slate

Slate (Metamorphosed Siltstone/Mudstone)

Septarian Nodule (Yellow Jasper variety)

Septarian Nodule (comprising Calcite, Aragonite, and Limestone/Bentonite)

Tumbled milky quartz with iron staining

Quartz, silicon dioxide (SiO₂), likely massive quartz or quartz vein material

Quartz (Citrine / Yellow Quartz)

Silicon Dioxide (SiO2)

Tumbled dark flint/chert

Microcrystalline quartz (SiO₂), commonly with chalcedony and iron-oxide impurities

Polished jasper pebble

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions

Yellow Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)