Mineralogical Specimen

Ocean Jasper (Orbicular Jasper)

Silica (SiO2) with varied mineral inclusions

Graphite-bearing quartz-mica schist

Graphite-rich quartz–mica schist; primarily quartz (SiO₂), muscovite/biotite, and graphite (C)

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt

Quartzite

Quartzite (primarily SiO2)

Diorite

Diorite (Intermediate intrusive igneous rock)

Amphibolite

Amphibolite (rich in amphibole and plagioclase feldspar)

Gneiss

High-grade Metamorphic Gneiss

Red Granite

Phaneritic Felsic Intrusive Igneous Rock (primarily K-feldspar, Quartz, and Biotite)

Quartzite

Quartzite (SiO2)

Granite

Phaneritic Igneous Rock (Granite)

Weathered greenish rock fragment

Indeterminate; possibly epidote- or chlorite-bearing altered silicate rock

Tiger's Eye (with Hematite/Jasper)

SiO2 (Silicon Dioxide) with Fe2O3 (Hematite)

Small brown-gray mineral fragment

Indeterminate; possibly weathered quartz-, feldspar-, or iron-oxide-bearing rock

Iron Slag

Iron smelting byproduct (Glassy/vesicular silicate)

Serpentinite (probable)

Serpentinite, dominated by serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with dark magnetite or chromite and pale carbonate/talc possible

Pink Granite

Potassium Feldspar-Rich Granite

Tumbled sodalite (probable)

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly blue-dyed jasper or lapis lazuli

Citrine

Silicon Dioxide (SiO2)

Osumilite in Granite Matrix

(K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30

Sandstone

Clastic sedimentary rock (primarily SiO2)

Granite

Phaneritic plutonic rock (approx. 20-60% quartz, 35-90% feldspar)

Quartz-rich breccia or vein quartz with iron staining

Microcrystalline to crystalline SiO₂, likely quartz with iron oxides/hydroxides and altered host rock

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

Granite

Granite (Phaneritic igneous rock)

Tumbled lepidolite-rich pegmatite (probable)

Lepidolite, K(Li,Al)3(Si,Al)4O10(F,OH)2, in a granitic pegmatite matrix

Geode with Quartz/Chalcedony

Silicon Dioxide (SiO2)

Blue glass-like tumbled specimen

Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image

Weathered iron-rich rock (probable laterite or limonite-bearing stone)

Goethite–limonite mixture, commonly written FeO(OH)·nH₂O, with possible quartz and clay minerals

Tumbled gray stone, likely serpentinite or weathered basalt

Tentatively serpentinite (predominantly serpentine-group minerals); identification is uncertain from the photograph

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Serpentinite (likely serpentinized ultramafic rock)

Serpentine-group minerals, chiefly antigorite/lizardite; commonly derived from peridotite

Blue-green raw mineral specimen, likely apatite

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

Manganese Dendrite on Siltstone

Manganese Oxide (pyrolusite or psilomelane) Dendrites

Pyrite Sun (Pyrite Dollar)

Iron Disulfide (FeS2)

Likely polished leopard-skin jasper or brecciated jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with iron-oxide and other mineral inclusions; exact variety cannot be confirmed from the image alone

Onyx (Calcite Onyx / Mexican Onyx)

Calcium Carbonate (CaCO3)

Labradorite

(Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)

Fossilized oyster shell in limestone

Bivalvia fossil; chiefly calcite (CaCO₃)

Rhyolite

Extrusive Felsic Igneous Rock

Mixed River Pebbles (Jasper, Hematite, and Quartzites)

Silicon dioxide (Jasper/Quartz) and Iron oxide (Hematite)

Sand Grain (Quartz)

Silicon Dioxide (SiO2)