Sedimentary Rock (Altered)

Unakite (likely)

Epidote–pink feldspar–quartz rock; commonly termed unakite

Greenstone (likely serpentinite)

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

Uncertain pale granitoid or weathered feldspathic rock

Likely granite or granodiorite; chiefly quartz, feldspar, and minor mica, but the photograph is insufficient for precise identification.

Raw greenish-blue quartz-bearing mineral specimen

Likely fluorite or chalcedony/quartz; exact identification requires hardness and crystal tests

Iron-stained quartz

Quartz (SiO₂), likely limonite/goethite-stained

Zebra Jasper

Microcrystalline quartz with impurities

Blue Chert

Microcrystalline Quartz (SiO2)

Weathered brown rock fragment, possibly iron-rich basalt or breccia

Tentatively basaltic rock; exact identification requires testing

Epidosite

Epidosite (composed primarily of Epidote and Quartz)

Banded metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica gneiss/schist; exact identification requires thin-section or tests

Weathered dark volcanic rock, possibly basalt

Basalt (tentative; likely iron-rich mafic volcanic rock)

Epidote

Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

Fuchsite Schist

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Schist

Turquoise (Rough Specimens)

Hydrous phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O

Quartz-rich vein rock, possibly milky quartz in altered host rock

Quartz (SiO₂), likely with weathered silicate minerals and iron/manganese staining

Unakite

Epidote–pink feldspar–quartz rock

Lapis Lazuli (Low Grade)

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)

Weathered iron-rich basalt or volcanic scoria

Altered basalt, likely limonite/goethite-bearing (tentative)

Weathered feldspar-rich igneous rock, likely granite or granodiorite fragment

Granite–granodiorite; chiefly quartz (SiO₂), plagioclase and potassium feldspar, with minor dark biotite/hornblende

Unidentified dark reddish-brown rock or mineral specimen

Indeterminate from the blurred image; possibly iron-stained quartz, jasper, or a metallic sulfide-bearing rock

Likely serpentinite pebble

Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite or lizardite); identification from the image is uncertain

Pink granite (weathered hand specimen)

Felsic intrusive igneous rock; chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende

Polished tiger’s-eye cabochon

Chatoyant quartz (SiO₂), typically quartz pseudomorphically replacing crocidolite fibers

Iron-stained quartz-rich rock, possibly ironstone or quartz-vein material

Quartz (SiO₂) with iron oxides/hydroxides; exact host rock cannot be determined from the image

Dalmatian jasper

Spotted rhyolite (commercially called Dalmatian jasper), chiefly quartz and feldspar with black aegirine/arfvedsonite inclusions

Blue quartz-bearing rock, possibly chrysocolla-bearing quartzite

Quartz (SiO₂), with probable blue chrysocolla or copper-bearing clay minerals; exact identification requires testing

Polished quartz-rich breccia

Quartz–feldspar breccia; predominantly SiO₂ with feldspar and iron-oxide minerals

Tumbled yellow jasper or iron-stained quartzite

Microcrystalline quartz (SiO₂), likely jasper/quartzite with iron-oxide staining

Orbicular jasper / brecciated jasper slab

Silicified volcanic rock composed mainly of microcrystalline quartz (SiO₂), with iron-oxide and possible chalcedony/agate bands

Milky quartz with iron-oxide staining and dark matrix

Quartz (SiO₂), likely with hematite/goethite and minor feldspar or mica

Veined quartz-bearing metamorphic rock

Likely quartzite or siliceous schist with iron-oxide staining

Orange calcite

Calcite (CaCO₃), likely a botryoidal or rough aggregate

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Tumbled basalt (likely vesicular basalt)

Basalt; primarily plagioclase, clinopyroxene, and olivine, with iron oxides

Weathered volcanic rock, likely andesite

Porphyritic andesite (tentative; image alone cannot confirm composition)

Tumbled jasper pebble

Microcrystalline quartz (SiO₂), commonly with iron-oxide inclusions

Polished granite pebble

Granite; chiefly quartz, feldspar, and mica/amphibole

Copper-bearing basalt or volcaniclastic rock

Cuprite–malachite-bearing mafic volcanic rock; likely basalt with copper sulfides/oxides

Mottled river cobble, likely porphyritic volcanic rock

Possibly porphyritic andesite or basalt; exact identification requires closer examination

Quartz-rich pegmatite

Granitic pegmatite, chiefly quartz (SiO₂) with feldspar and possible mica

Limonite/goethite-rich ironstone

Hydrated iron oxides, chiefly goethite (α-FeO(OH)) and limonite (FeO(OH)·nH₂O)

Weathered quartz-rich rock, probably granite or granitic gneiss

Granite–gneiss assemblage; chiefly quartz (SiO₂), feldspars, and iron-stained mafic minerals