Mixed (Sedimentary, Igneous, And Metamorphic)

Pyrite

Iron sulfide (FeS2)

Mixed beach-stone collection, primarily quartz-rich pebbles and possible fossils

Likely quartz (SiO₂), quartzite, chert, and carbonate rock; exact identification is uncertain from the image

Mixed weathered field rocks, likely sandstone and shale/slate

Indeterminate clastic rocks; possible quartz-rich sandstone with laminated shale or slate

Mixed River Pebbles and Rock Collection

Polymictic lithic conglomerate, sandstone, and quartz pebbles

Clear Quartz (Faceted)

Silicon Dioxide (SiO2)

Quartz (Tumbled)

SiO2 (Silicon Dioxide)

Quartz (Citrine or Iron-Stained)

SiO2

Citrine

Silicon dioxide (SiO2)

Apatite

Ca5(PO4)3(F,Cl,OH)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz fragment

Silicon Dioxide (SiO2)

Blue Apatite

Ca5(PO4)3(F,Cl,OH)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Fossilized marine shell fragment

Likely a bivalve or gastropod shell preserved as calcite (CaCO₃)

Tumbled jasper (likely brecciated or red jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions

Tiffany Stone

Fluorite-bearing Opalized Breccia

Blue Apatite

Apatite, Ca5(PO4)3(F,Cl,OH)

Mixed beach pebbles and shell fragments

Mostly carbonate rocks, likely limestone/calcarenite, with mollusk-shell bioclasts; exact species cannot be determined visually

Alluvial stream gravel (mixed rock specimens)

Polymictic fluvial deposit; likely mixtures of quartzite, sandstone, shale, chert, basalt, and granite-derived minerals

Mixed river pebbles and quartz-rich specimens

Polymictic fluvial gravel; likely quartz, quartzite, chert, and weathered feldspathic rocks

Quartz (Smoky/Brown variety)

Silicon dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Botryoidal hematite (ironstone)

Hematite, Fe₂O₃; likely a botryoidal or massive iron-oxide specimen

Pumice

Vesicular volcanic glass (Amorphous silica mixed with various oxides)

Fossiliferous limestone fragment

Calcitic limestone; mainly calcium carbonate (CaCO₃), possibly with shell or coral debris

Milky Quartz

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Agate

SiO2 (Chalcedony/Quartz)

Quartz with Inclusions

Silicon Dioxide (SiO2)

Pyrite in Matrix (Fool's Gold)

Iron Sulfide (FeS2)

Possible tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂), variably mixed with iron oxides

Quartz-rich rock fragments, likely granite or gneiss

Granite/gneiss assemblage; chiefly quartz (SiO₂), feldspar, and mica

Small dark mineral or rock fragment

Undetermined; possibly a dark mafic mineral such as biotite or magnetite

Copper Ore Specimen

Cupriferous Rock / Malachite-bearing ore

Polymict conglomerate

Clastic conglomerate, likely polymictic and matrix-supported

Mixed River Pebbles (Jasper, Hematite, and Quartzites)

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

Rainbow Moonstone (White Labradorite)

Labradorite (White varieties with Schiller effect), (Na,Ca)(Al,Si)4O8

Sandstone

Clastic sedimentary rock, predominantly quartz (SiO₂) sand grains cemented by silica, calcite, or iron oxides

Pyrite

Iron Sulfide (FeS2)

Unakite

Altered Granite (Epidotized Granite)

Likely tumbled hematite-rich ironstone

Hematite, Fe₂O₃, possibly mixed with goethite or magnetite

Botryoidal hematite (iron-oxide specimen)

Hematite, Fe₂O₃; possibly mixed with goethite/limonite