Sedimentary Rock (Altered)

Likely weathered quartz-bearing rock (uncertain identification)

Possibly quartz-rich granite or granitic aplite; exact identification requires a clearer, larger image and tests

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Jasper

Microcrystalline Quartz (SiO2)

Lapis Lazuli

Lazurite-dominated contact metamorphic rock

Yellow-green jasper or serpentine-rich rock

Likely microcrystalline quartz (SiO₂) with iron-bearing and/or serpentine minerals; exact identification requires testing

Dzi Bead (Agate)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Unakite

Altered Granite (Epidotized Granite)

Fossilized bivalve shell fragment

Pectinid or related scallop bivalve; shell originally composed mainly of calcite (CaCO₃)

Unakite

Altered Granite (Plagioclase-Epidote-Quartz Rock)

Chrysocolla-bearing copper mineral specimen (probable turquoise/chrysocolla mix)

Chrysocolla, Cu₂H₂Si₂O₅(OH)₄·nH₂O, with possible turquoise CuAl₆(PO₄)₄(OH)₈·4H₂O and copper oxides

Tumbled granite

Granite, chiefly quartz, feldspar, and mica

Green Serpentine

Serpentine group (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4

Lapis Lazuli

Lapis Lazuli (Metamorphic rock primarily composed of Lazurite, Calcite, and Pyrite)

Unakite

Altered Granite (Epidotized Granite)

Weathered iron-rich rock, possibly laterite or altered basalt

Probable ferruginous basalt/lat eritic material; exact identification requires testing

Tumbled tiger’s-eye-rich quartzite

Quartzite, composed mainly of microcrystalline quartz (SiO₂) with fibrous crocidolite pseudomorphs and iron oxides

Weathered greenish rock fragment

Indeterminate; possibly epidote- or chlorite-bearing altered silicate rock

Weathered sandstone or volcanic rock fragment

Indeterminate; likely quartz–feldspar-rich sandstone, possibly altered volcanic rock

Iron-rich jasper (likely brecciated jasper)

Microcrystalline quartz/chalcedony (SiO₂) colored by hematite/goethite; possibly iron formation

Greenstone

Metamorphosed Mafic Igneous Rock

Turquoise

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

Weathered granite or granitic gneiss

Granite; predominantly quartz, feldspar, and mica, possibly altered to gneiss

Likely tumbled dark volcanic rock

Probably basalt or fine-grained andesite; exact identification requires testing

Rhyolite or jasper-bearing volcanic rock

Rhyolite, likely altered and silicified; red coloration may come from hematite

Quartz-rich granite or granitic gneiss

Granite; primarily quartz (SiO₂), feldspar, and minor mica

Unakite

Unakite (Epidotized Granite)

Unakite

Altered Granite (Epidotized Granite)

Tumbled pale greenish stone, likely serpentine or altered limestone

Probable serpentine-group rock (antigorite/lizardite), possibly serpentinite; identification is visual only

Serpentinite

Serpentinite (composed primarily of Antigorite, Lizardite, or Chrysotile)

Pink Granite / Gneiss Pebble

Quartz-Feldspar Granitic Rock

Polished gray-brown stone slab, possibly soapstone or schist

Indeterminate; likely talc-rich soapstone (steatite) or mica schist

Possible weathered quartz-rich rock or iron-stained mineral fragment

Indeterminate; possibly quartz (SiO₂) with iron-oxide inclusions

Weathered iron-rich rock (likely basalt or ironstone)

Probable altered basalt; exact identification requires testing

Tumbled copper-bearing rock, likely chrysocolla-bearing basalt or copper ore

Chrysocolla (hydrated copper phyllosilicate, approximately Cu₂H₂Si₂O₅(OH)₄·nH₂O) in a dark volcanic host

Weathered iron-rich basalt or laterite

Basalt, likely limonitized/goethite-stained; exact identification requires testing

Weathered granite (likely biotite granite)

Granite; interlocking quartz, feldspar, and mica, commonly with biotite

Blue-gray quartz-bearing rock, likely dumortierite quartz or silicified metamorphic rock

Quartz (SiO₂) with probable dumortierite and iron-oxide inclusions

Milky quartz with dark mineral veins

Quartz, silicon dioxide (SiO₂), likely massive vein quartz; dark veins may be chlorite, mica, iron/manganese oxides, or a sulfide mineral

Greenish quartz (likely prase/chalcedony)

Quartz, SiO₂; possibly green chalcedony or chlorite-included quartz

Jasper

Microcrystalline Quartz (SiO2)

Weathered granitic or gneissic pebble

Granite–gneiss assemblage; quartz + feldspar + dark mafic minerals

Unakite

Altered Granite (Epidotized Granite)