All rocks & minerals

Milky quartz

Quartz (SiO₂), commonly called milky quartz

Rose quartz

Quartz, silicon dioxide (SiO₂); pink variety commonly called rose quartz

Tumbled tiger’s eye

Tiger’s-eye quartz; SiO₂ with iron-oxide-rich bands, commonly after crocidolite

Small brown mineral or rock fragment (not identifiable from the image)

Undetermined; the specimen is too small and lacks visible diagnostic features for reliable identification

Polished jasper or agate pebble

Microcrystalline quartz (SiO₂), likely jasper/chalcedony; exact variety is uncertain from the photo

Small weathered rock fragment (likely sandstone)

Quartz-rich sandstone; exact identification is uncertain from the image

Unidentified dark-brown rock fragment

Not identifiable from the image; possibly a common mafic rock fragment

Small tan pebble, possibly chert or quartz-rich stone

Unidentified silica-rich rock; possibly microcrystalline quartz (chalcedony/chert)

Tumbled yellow chalcedony (possibly citrine or pale agate)

Chalcedony, microcrystalline quartz (SiO₂); exact variety cannot be confirmed visually

Small rounded stone, likely a pebble

Unidentified fine-grained lithic pebble; image alone does not support a reliable mineral or rock-species identification

Likely tumbled brown agate

Microcrystalline quartz (SiO₂), chalcedony variety; precise identification is uncertain from the photo

Small yellow-brown mineral specimen, likely citrine or yellow quartz

Quartz (SiO₂), possibly iron-colored citrine; identification is uncertain from the image

Small brown pebble, possibly jasper or iron-stained quartz

Undetermined; likely quartz (SiO₂) or iron-oxide-stained silica

Small brown pebble, possibly chert or iron-stained quartz

Undetermined; visual identification is inconclusive

Likely rough amber

Amber (fossilized tree resin; composition varies, commonly dominated by polymerized terpenoids)

Chert (likely brown flint)

Microcrystalline quartz (SiO₂), commonly termed chert or flint

Likely brown chert (flint) pebble

Microcrystalline quartz (SiO₂)

Brown chert (possible jasper)

Microcrystalline quartz (SiO₂), with iron-oxide coloring

Small brown stone, possibly a weathered quartz-rich pebble

Undetermined; the image does not show enough detail for a reliable identification

Small brown stone (indeterminate)

Unidentified; the image does not show enough detail for a reliable identification

Small brown mineral or rock fragment

Undetermined; the image lacks enough detail for a reliable identification

Small brown mineral fragment, possibly amber-colored quartz or chalcedony

Undetermined from image; quartz/chalcedony (SiO₂) is one possibility

Tumbled yellow calcite

Calcite (CaCO₃)

Tumbled carnelian

Chalcedony, a microcrystalline variety of quartz (SiO₂)

Tumbled brown stone, likely jasper

Likely microcrystalline quartz (SiO₂), possibly iron-stained jasper; exact identification is uncertain from the photo

Possible ironstone or iron-oxide-rich mineral fragment

Unidentified iron oxide/hydroxide, possibly goethite or limonite

Small brown pebble (likely iron-stained quartzite)

Quartz-rich rock; precise identification is not possible from the image alone

Chert (likely flint)

Microcrystalline quartz (SiO₂), variety chert; flint is a dark chert variety

Black tumbled stone, possibly obsidian

Obsidian, naturally occurring rhyolitic glass; identification is uncertain from the image alone

Small dark-brown mineral pebble, identity uncertain

Not identifiable from the image; possibilities include iron-rich minerals such as magnetite or hematite

Small dark pebble, likely fine-grained sedimentary rock

Undetermined; possibly siltstone or mudstone

Brown faceted gemstone, possibly smoky quartz

Undetermined; smoky quartz is SiO₂

Small dark rock fragment (unidentified)

Undetermined; the image is insufficient for reliable mineral or rock identification

Polished black stone, possibly black tourmaline

Uncertain from the image; possibly schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Small dark pebble, possibly basalt

Unidentified fine-grained mafic rock; basalt is a tentative visual match

Dark river pebble (likely basalt or andesite)

Fine-grained basaltic or andesitic volcanic rock; exact identification is not possible from the image alone

Dragon Vein Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Green jade-like cabochon pendant

Unidentified green gem; possibly jadeite (NaAlSi₂O₆) or nephrite (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂)

Green garnet (likely tsavorite or demantoid), small polished cabochon

Garnet-group silicate; tsavorite is grossular, Ca₃Al₂(SiO₄)₃, while demantoid is andradite, Ca₃Fe₂(SiO₄)₃

Rounded river pebble, likely fine-grained volcanic rock

Indeterminate from the image; possibly andesite or basalt

Likely fossil-bearing limestone fragment

Limestone, chiefly calcite (CaCO₃); exact identification is uncertain from the image

Diamond-set gold ring

Diamond (crystalline carbon, C); mounted in a gold alloy setting