Sedimentary Rock (Altered)

Likely basalt (possibly weathered volcanic rock)

Basalt; predominantly plagioclase feldspar and pyroxene, with possible olivine and iron oxides

Quartz (Milky or Smoky variant)

Silicon Dioxide (SiO2)

Serpentine (likely antigorite/lizardite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄

Likely serpentinite or serpentine-rich rock

Serpentinite, composed chiefly of serpentine-group minerals (e.g., antigorite, lizardite, or chrysotile)

Likely serpentinite

Serpentinite, composed mainly of serpentine-group minerals (e.g., lizardite, antigorite, or chrysotile)

Chrysoprase (green chalcedony), likely rough fragment

Chalcedony, microcrystalline quartz (SiO₂), colored green primarily by nickel-bearing inclusions

Copper-bearing volcanic breccia

Altered andesite or rhyolite breccia with secondary copper minerals, likely chrysocolla and/or malachite

Weathered granitic rock

Granite or granodiorite; primarily quartz (SiO₂), feldspar, and mica

Iron-stained quartz-rich rock, possibly weathered granite or quartzite

Uncertain from image; likely quartz (SiO₂) with feldspar and iron-oxide staining

Tumbled greenstone / serpentine pebble

Serpentinite, dominated by serpentine-group minerals (Mg₃Si₂O₅(OH)₄)

Milky quartz-bearing rock (likely quartz vein fragment)

Quartz, silicon dioxide (SiO₂), with probable iron-oxide staining and dark host-rock inclusions

Polished black stone, likely shungite

Shungite; carbon-rich mineraloid composed mainly of amorphous carbon, with silica and other minerals

Polished unakite pebble (likely)

Unakite: epidote, pink potassium feldspar, and quartz; composition varies

Epidote

Epidote Group (e.g., Clinozoisite, Epidote, Piemontite), Epidote formula: Ca2(Al,Fe)3(SiO4)3(OH)

Weathered greenstone (metabasalt)

Chlorite–actinolite metabasalt; composition varies, commonly plagioclase with chlorite, actinolite, epidote, and amphibole

Likely altered granite or feldspathic gneiss

Quartz–feldspar–mica rock; exact identification requires testing

Azurite with malachite

Azurite, Cu₃(CO₃)₂(OH)₂, with possible malachite, Cu₂CO₃(OH)₂

Weathered greenish rock fragment

Tentatively altered basalt or serpentinite; exact identification requires testing

Lapis lazuli pendant

Lapis lazuli; mainly lazurite (Na₃Ca(Si₃Al₃)O₁₂S), with calcite and pyrite

Amygdaloidal Basalt

Mafic extrusive igneous rock with secondary mineral infills

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Likely pale-green tumbled stone (possibly serpentine or jade-like material)

Not determinable from the image; possible serpentine-group rock, commonly antigorite/lizardite, or another pale-green silicate

Weathered granite or granitic pebble

Granite; chiefly quartz, feldspar, and mica

Tumbled pale-green stone, possibly serpentine

Indeterminate; appearance is consistent with serpentine-rich rock (serpentine minerals, approximately Mg₃Si₂O₅(OH)₄)

Likely serpentine-rich metamorphic rock

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile), with possible magnetite and minor chlorite/talc

Carnelian ring

Carnelian, a red-orange variety of chalcedony (microcrystalline quartz, SiO₂)

Polished green serpentine

Serpentinite, chiefly antigorite/lizardite Mg₃Si₂O₅(OH)₄

Weathered river stones, likely basaltic andesite and related volcanic rocks

Fine-grained mafic/intermediate volcanic rocks; commonly basalt (plagioclase + pyroxene ± olivine) or andesite (plagioclase + pyroxene ± amphibole)

Weathered porphyritic granite with lichen

Granite; predominantly quartz, feldspar, and mica (approximate composition)

Iron-stained quartz-rich rock, possibly jasper or hydrothermal breccia

Microcrystalline quartz (SiO₂) with iron oxides/hydroxides, likely hematite and goethite; exact identification requires testing

Possible flint/chert fragment

Microcrystalline quartz (SiO₂), likely chert or flint

Weathered iron-rich rock, possibly oxidized basalt or laterite

Indeterminate; likely iron-oxide-bearing mafic rock (basaltic composition)

Polished banded river stone

Likely foliated gneiss or banded metamorphic rock; exact identification requires a fresh surface or testing

Fossil shell fragment

Likely a marine mollusk shell, composed mainly of calcium carbonate (aragonite and/or calcite); exact species is not identifiable from the image.

Likely weathered quartz-bearing rock

Uncertain; possibly quartz-rich feldspathic material, with iron-oxide staining

Serpentinite (likely)

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly after peridotite

Porphyritic Basalt (likely artificially dyed or altered)

Basalt with plagioclase phenocrysts (likely treated)

Smoky Quartz

Silicon Dioxide (SiO2)

Greenstone pebble, likely altered basalt

Metabasalt/greenstone; commonly chlorite–epidote–actinolite with albite and iron oxides

Dark mafic rock, likely altered basalt or gabbro

Fine- to medium-grained mafic silicate rock; probable basaltic composition with plagioclase and pyroxene, possibly chloritized/serpentinized

Quartz geode slice

Quartz (SiO₂), likely chalcedony-lined geode with drusy quartz

Polished brecciated jasper (likely ocean jasper or orbicular jasper)

Silica-rich chalcedony/microcrystalline quartz (SiO₂), with iron-oxide and other mineral inclusions