Sedimentary Rock (Altered)

Blue-green quartz-rich stone, possibly chrysoprase or aventurine

Uncertain; likely quartz (SiO₂) with green coloration from nickel-bearing minerals or inclusions

Iron-stained quartz with limonite/goethite

Quartz (SiO₂) with iron oxyhydroxides, commonly goethite (α-FeO(OH)) and limonite

Copper-bearing rock, likely native copper in a matrix

Native copper (Cu), possibly with cuprite/malachite in a basaltic or porphyritic matrix

Greenstone with rusty mineral patches

Greenstone (metamorphosed mafic volcanic rock; likely chlorite–epidote–actinolite assemblage)

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

Porphyritic volcanic rock, likely andesite or basaltic andesite

Fine-grained plagioclase–pyroxene volcanic rock; exact identification requires microscopy or chemical testing

Weathered greenish metamorphic rock, likely serpentinite

Serpentinite, dominated by serpentine-group minerals (commonly antigorite, lizardite, or chrysotile)

Rounded greenstone cobble

Likely altered basalt/greenstone; commonly chlorite–actinolite–epidote rich

Quartz-bearing altered rock, likely quartzite or hydrothermal quartz vein

Predominantly quartz (SiO₂), with possible chlorite/serpentine and iron-oxide alteration

Serpentine-rich altered rock (likely serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, talc, or chlorite

Quartz-bearing altered rock, possibly iron-stained quartz vein

Quartz (SiO₂) in a feldspathic/sericitized host, with iron-oxide staining

Unakite

Altered Granite (Epidotized Feldspar with Quartz)

Quartz-rich granitic rock, possibly weathered pegmatite

Granite or pegmatitic quartz–feldspar aggregate; mainly SiO₂ quartz with K-feldspar/plagioclase and minor mica

Banded Gneiss

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

Weathered brown mineralized rock

Likely iron-stained quartzite or quartz-rich metamorphic rock; exact identification requires testing

Quartz-rich crystal aggregate

Quartz (SiO₂), possibly druzy quartz with iron-oxide staining

Likely weathered brown quartz-bearing rock

Tentatively weathered granite or granitic gneiss; exact identification is uncertain from the photograph

Likely weathered quartz or feldspar grain

Uncertain; possibly quartz (SiO₂) or a feldspar mineral

Weathered quartz-rich pebble

Likely quartzite or silicified granitoid; mainly microcrystalline quartz (SiO₂)

Greenish quartz (likely prase/chalcedony)

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

Weathered rhyolitic tuff or altered volcanic rock

Felsic volcanic tuff, likely devitrified or hydrothermally altered

Weathered, iron-stained metamorphic rock (likely gneiss or schist)

Uncertain from the photograph; possibly quartz–feldspar–mica gneiss or schist

Tumbled epidote-bearing granite or amphibolite

Quartz–feldspar rock with dark amphibole/biotite and epidote; exact identification is uncertain from the image

Unakite (likely)

Unakite; epidote–K-feldspar–quartz rock

Iron-rich volcanic rock, possibly hematite-bearing basalt

Basalt with iron oxides; possible hematite/magnetite alteration

Quartz-rich rock, possibly druzy quartz on altered host rock

Quartz (SiO₂), likely with mica/clay minerals and minor iron-oxide staining

Greenstone pebble (likely serpentinite)

Serpentinite, composed mainly of serpentine-group minerals

Serpentinite

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

Tumbled amethyst

Amethyst, purple variety of quartz (SiO₂)

Jasper

Silicon dioxide (SiO2)

Iron-stained quartz vein in weathered host rock

Quartz (SiO₂) with iron-oxide/hydroxide staining; host rock undetermined

Polished orbicular jasper (likely ocean jasper or similar orbicular jasper)

Silica-rich microcrystalline quartz/chalcedony, chiefly SiO₂; exact variety cannot be confirmed from the image

Polished green-gray stone, possibly serpentine

Likely serpentine-group rock, composed mainly of serpentine minerals; identification is uncertain from the photo

Epidote

Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Green copper-bearing rock, possibly chrysocolla-bearing matrix

Undetermined copper-mineralized rock; green areas may include chrysocolla, malachite, or chlorite

Greenstone (Prase / Metavolcanic)

Metamorphosed volcanic rock (Greenstone)

Red porphyritic volcanic rock, likely rhyolite or andesite

Porphyritic rhyolite–andesite; predominantly quartz/feldspar with iron-oxide staining

Likely garnet-bearing rock fragment

Garnet-bearing schist or gneiss; garnet is commonly almandine, Fe₃Al₂(SiO₄)₃

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)