Mineraloid (Anthropogenic)

Serpentine-rich metamorphic rock

Serpentinite; chiefly antigorite/lizardite Mg₃Si₂O₅(OH)₄, possibly with talc, chlorite, magnetite, or carbonate

Weathered, iron-stained feldspathic rock (probable granite or granitic pegmatite)

Quartz–feldspar granitoid; visible blue grains may be altered feldspar or accessory minerals

Weathered iron-rich rock, possibly limonite-bearing sandstone or laterite

Limonite/goethite mixture (hydrated iron oxides), composition uncertain from image

Granite (Dioritic or Hornblende-rich)

Phaneritic Plutonic Felsic to Intermediate Igneous Rock

Quartz-veined metamorphic rock, likely quartzite or schist

Quartz-rich metamorphic rock with a milky-quartz vein; exact host rock is indeterminate from the photo

Granite-like pegmatitic rock

Coarse-grained granite or granitic pegmatite; likely quartz–feldspar–mica aggregate

Serpentinite with carbonate veins and weathering rind

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), with calcite/magnesite and accessory magnetite

Weathered gray-green basaltic rock

Basalt, likely altered to low-grade greenschist/amphibolite facies

Iron-rich concretion or slag-like rock

Goethite–hematite limonite concretion, possibly iron slag

Greenstone / altered basalt (probable)

Chlorite–epidote–actinolite aggregate; commonly metabasalt (greenstone)

Iron-rich breccia or weathered ironstone

Goethite–hematite-bearing ferruginous rock, possibly limonite

Serpentine-rich metamorphic rock

Serpentinite, likely with quartz or calcite veining and minor magnetite

Eclogite

Eclogite (Omphacite-Garnet rock)

Amphibolite

Amphibolite (rich in amphibole and plagioclase feldspar)

Quartz-bearing rock, possibly weathered granite or pegmatite

Quartz–feldspar–mica aggregate; exact classification is uncertain from the image

Quartz-rich pegmatite (weathered feldspar–quartz rock)

Granitic pegmatite; primarily quartz (SiO₂), feldspar, and minor biotite/iron-oxide minerals

Quartzite

Quartzite (SiO2)

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Uncertain polymict breccia or altered volcanic rock

Likely hydrothermally altered volcanic breccia; exact mineral identification requires testing

Granite

Granite (Felsic intrusive igneous rock)

Mica Schist

Mica Schist (primarily Muscovite or Biotite)

Gneiss

High-grade Metamorphic Gneiss

Tumbled serpentine-rich altered rock

Serpentinite, likely antigorite/lizardite with accessory carbonate, quartz, or iron oxides

Likely graphite-rich schist (possibly galena-bearing metamorphic rock)

Graphite schist; chiefly quartz–mica with graphite (identification uncertain from photograph)

Unakite (likely)

Epidote–pink feldspar–quartz rock; commonly termed unakite

Polished green jasper cabochon (likely serpentine or nephrite imitation)

Jasper: microcrystalline quartz (SiO₂); green coloration may reflect chlorite, epidote, or iron minerals

Dalmatian jasper (likely orbicular microgranite)

Quartz–feldspar–biotite/pyroxene microgranite; commonly marketed as Dalmatian jasper

Dendritic Quartz

Silicon Dioxide (SiO2) with Manganese Oxide inclusions

Tumbled kambaba jasper (likely)

Kambaba jasper, a silica-rich microcrystalline quartz aggregate, commonly containing fossilized cyanobacterial structures and dark green amphibole/pyroxene minerals

Blue-green raw mineral specimen, likely apatite

Fluorapatite, Ca₅(PO₄)₃F (probable; visual identification only)

Polished porphyritic volcanic rock, likely andesite or basalt

Porphyritic andesite/basalt; commonly plagioclase and pyroxene phenocrysts in a fine volcanic groundmass

Black volcanic rock, likely basalt

Basalt; primarily plagioclase feldspar and pyroxene, commonly with minor olivine or magnetite

Greenish weathered volcanic rock, likely altered basalt

Altered basalt/mafic volcanic rock; green coloration may reflect chlorite, epidote, or celadonite

Likely weathered basalt pebble

Basalt, a fine-grained mafic volcanic rock; commonly composed of plagioclase, pyroxene, and minor olivine

Granite

Intrusive igneous rock composed mainly of quartz, alkali feldspar, and plagioclase

Gneiss (specifically a granitic gneiss cobble)

Gneiss (high-grade regional metamorphic rock)

Tumbled serpentinite (likely)

Serpentinite; chiefly antigorite/lizardite/chrysotile, Mg3Si2O5(OH)4, with accessory magnetite and possibly chromite

Weathered iron-rich rock, possibly basalt or ironstone

Indeterminate; likely Fe-oxide-bearing basaltic rock (commonly magnetite/hematite in a silicate matrix)

Quartz-bearing weathered rock

Massive to drusy quartz (SiO₂), possibly in a feldspathic or carbonate host

Altered volcanic rock, possibly andesite

Likely porphyritic andesite or dacite with secondary chlorite/epidote and quartz–calcite veins

Serpentinite (probable)

Serpentinite; chiefly serpentine-group minerals, Mg3Si2O5(OH)4, with possible magnetite, chromite, and carbonate

Serpentinite

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and minor chromite