Metamorphic (Altered Igneous Rock)

Red jasper in gray host rock (likely hematite-stained quartzite or rhyolite)

Jasper: microcrystalline quartz (SiO₂), with iron-oxide coloration; exact host uncertain from image

Small quartz-rich mineral fragment

Quartz (SiO₂), possibly milky or chalcedonic quartz

Possible basalt or iron-rich river pebble

Fine-grained mafic rock, likely basalt (plagioclase–pyroxene ± olivine, with iron oxides)

Polished greenstone (likely serpentine or altered basalt)

Serpentinite, chiefly serpentine-group minerals; possible chlorite/actinolite-bearing greenstone

Tiger's Eye

Silicon Dioxide (SiO2) with Crocidolite inclusions

Likely weathered basalt or mafic volcanic rock

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides

Unakite

Unakite (altered granitic rock: SiO2 + Ca2(Al,Fe)3(SiO4)3(OH))

Turquoise

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

Rounded brown pebble, likely weathered basalt or lateritic rock

Probable fine-grained basalt; exact identification uncertain from the photograph

Citrine (likely Heat-Treated Amethyst)

Silicon Dioxide (SiO2)

Prehnite with Epidote

Prehnite (Ca2Al(AlSi3O10)(OH)2) with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Lapis Lazuli

Na8[Al6Si6O24]S2

Brecciated Jasper

Silicon Dioxide (SiO2) with iron impurities

Unakite (likely), tumbled specimens

Unakite: epidote + pink potassium feldspar + quartz; composition varies and may include chlorite

Tiger's Eye

Pseudomorph of quartz after crocidolite (SiO2)

Tumbled granite or granitic gneiss

Granite, primarily quartz, alkali feldspar, plagioclase, and dark biotite/amphibole

Weathered granite or granitic gneiss

Granite; mainly quartz, feldspar, and mica

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Red Jasper or Ferruginous Chert

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Soapstone Carving

Steatite

Tumbled pale greenish stone, likely serpentine or altered limestone

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

Unakite

Epidote-Feldspar rock (specifically, a variety of granite)

Amethyst Geode

Quartz (Silicon Dioxide, SiO2)

Unakitized Granite

Granite / Altered Monzonite with Epidote

Tiger's Eye

Silicon dioxide with crocidolite fibers (SiO2 with chrysotile amphibole inclusions)

Fuchsite Schist

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

Jasper (Banded Jasper / Chert)

Silicon Dioxide (SiO2 with iron oxide inclusions)

Rounded volcanic pebble

Likely basaltic-andesite or altered basalt; exact identification requires testing

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Jasper

Microcrystalline Quartz (SiO2)

Lapis Lazuli

Lapis Lazuli (aggregate of Lazurite, Calcite, and Pyrite)

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2, with varying amounts of Calcite, Pyrite, and Sodalite).

Clear Quartz (Cut/Faceted Gemstone)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss

Rounded gray river pebble

Likely fine-grained quartz-rich sandstone or siltstone; exact identification requires a fresh surface and tests

Lapis Lazuli

Lapis Lazuli (Complex silicate mineral mixture primarily Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Lapis Lazuli

Lapis lazuli (primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Unakite

Granitic Unakite (Alteration rock composed of pink orthoclase feldspar, green epidote, and clear quartz)

Turquoise

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

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Weathered mafic rock, likely basalt or greenstone

Fine-grained basaltic rock; possibly altered basalt (metabasalt/greenstone)