Sedimentary Rock (Altered)

Greenstone / River Jadeite pebble

Metavolcanic rock / Chlorite or Actinolite-rich schist

Unakite / Red Jasper beach pebble

Altered Granite (Epidotized Feldspar and Quartz)

Unidentified weathered rock fragments

Likely mixed quartz- and feldspar-bearing silicate material; exact identification requires testing

Tumbled pink-orange feldspar

Microcline or orthoclase feldspar, KAlSi₃O₈ (tentative)

Brecciated Jasper (Polished)

Silicon Dioxide (SiO2) with Iron Oxide Impurities

Greenstone (or River-tumbled Basalt / Greywacke with Epidote)

Metabasalt / Greenschist facies rock

Weathered granite or granitic pebble

Granite; chiefly quartz, feldspar, and mica

Pale green rough mineral specimen, likely serpentine or calcite

Probable serpentine-group mineral, Mg₃Si₂O₅(OH)₄; possibly pale-green calcite, CaCO₃

Quartzite with Mica Matrix

Metamorphic Quartz-Mica Schist/Quartzite

Polished basalt pebble (likely basalt with quartz/zeolite veins)

Basalt; mainly calcic plagioclase and pyroxene, with possible alteration minerals such as quartz, calcite, or zeolites

Raw greenish-blue quartz-bearing mineral specimen

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

Unakite

Altered Granite (Epidotized Feldspar with Quartz)

Polished Yellow Jaspar

Chalcedony / Quartz (SiO2 with Iron Oxides)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in Altered Host Rock

Greenstone Porphyry

Altered Porphyritic Andesite/Basalt

Tumbled jasper or rhyolitic porphyry

Silicic volcanic rock, likely rhyolite (quartz- and feldspar-rich), possibly jasperized

Tumbled epidote-bearing granite or amphibolite

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

Epidote

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

Likely weathered brown quartz-bearing rock

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

Quartz vein in dark host rock

Quartz (SiO₂), likely in basalt, gabbro, or altered mafic rock

Weathered green-gray stone, likely serpentinite or chlorite-rich metamorphic rock

Probable serpentinite (antigorite–lizardite), possibly chlorite schist or altered basalt

Banded Rock (likely Quartz-rich)

Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals

Epidote

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

Banded Gneiss

Gneiss

Brecciated jasper, possibly rainforest jasper or brecciated rhyolite

Brecciated microcrystalline quartz (SiO₂), commonly called jasper; the green portions may contain epidote, chlorite, or iron-bearing silicates, while red-brown areas are typically hematite or other iron oxides

Weathered brown mineralized rock

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

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Unakite (likely)

Epidote–pink feldspar–quartz rock; commonly termed unakite

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Green-and-gold apatite-bearing rock, possibly epidote skarn

Apatite-group mineral, commonly fluorapatite (Ca₅(PO₄)₃F), with probable epidote and quartz; exact identification requires testing

Tumbled lapis lazuli

Lapis lazuli; predominantly lazurite, (Na,Ca)₈(AlSiO₄)₆(S,SO)₄, with calcite and pyrite

Orbicular jasper (ocean jasper)

Microcrystalline quartz (SiO₂), chiefly chalcedony with feldspar, zeolites, and iron-oxide inclusions

Garnet Gneiss

Garnetiferous quartzo-feldspathic gneiss

Unidentified weathered mineral/rock fragment

Indeterminate; likely a weathered iron-rich silicate or sulfide-bearing specimen

Unakite

Epidotized Granite

Iron-rich volcanic rock, possibly hematite-bearing basalt

Basalt with iron oxides; possible hematite/magnetite alteration

Porphyritic basalt or andesite pebble

Porphyritic volcanic rock; commonly plagioclase phenocrysts in a fine mafic-to-intermediate matrix

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Weathered basaltic cobble

Altered basalt, predominantly plagioclase and pyroxene

Milky quartz vein rock

Quartz, silicon dioxide (SiO₂), likely with iron-oxide staining and minor mica or sulfide minerals

Lapis Lazuli

Lapis lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Polished brecciated jasper (likely ocean jasper or orbicular jasper)

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