Man Made Object (Metal Alloy)

Rough Diamond

Diamond (Pure Carbon: C)

Tumbled jasper pebble

Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities

Quartzite

Quartzite (SiO2)

Nephrite Jade (or Serpentine)

Nephrite (a variety of amphibole mineral tremolite-actinolite) or Serpentine Group minerals

Fluorite

Fluorite (CaF2)

Feldspar

Triclinic or Monoclinic Tectosilicate (e.g., KAlSi3O8)

Clear Quartz

Silicon Dioxide (SiO2)

Granite

Intrusive igneous rock primarily composed of quartz, alkali feldspar, and plagioclase

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Orange Calcite (Polished Sphere)

Calcium Carbonate (CaCO3)

Dalmatian jasper

Dalmatian stone; commonly a leucocratic alkali-feldspar-rich igneous rock with arfvedsonite or aegirine inclusions

Banded Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Mica schist (possibly garnet–mica schist)

Muscovite–biotite schist; chiefly quartz, feldspar, muscovite, and biotite

Granite

Plutonic Igneous Rock

Fluorite and Mineral Collection

Calcium Fluoride (CaF2)

Coal

Combustible sedimentary rock

Chert / Flint

Silicon Dioxide (SiO2)

Schist

Mica Schist

Larimar

Pectolite (a variety of pectolite, NaCa2Si3O8(OH))

Diamond

Carbon (C)

Granite

Intrusive Igneous Rock

Diamond

Carbon (C)

Polished zebra jasper

Jasper, microcrystalline quartz (SiO₂), with iron-oxide and manganese-rich banding

Calcite

Calcium Carbonate (CaCO3)

Calcite

Calcium Carbonate (CaCO3)

Granite

Felsic intrusive igneous rock

Rhodonite

Manganese Inosilicate (MnSiO3)

Granite Pebble

Granite

Diamond (in a jewelry setting)

Cubic Carbon (C)

Red jasper (likely iron-rich chert)

Microcrystalline quartz (SiO₂), colored by hematite/goethite; possibly brecciated jasper

Serpentinite

Serpentinite; chiefly serpentine-group minerals (chrysotile, lizardite, antigorite), commonly with magnetite, brucite, and relict olivine/pyroxene

Polished orbicular jasper (likely ocean jasper)

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

Petrified Wood

Silicified Wood (SiO2)

Calcite

Calcium Carbonate (CaCO3)

Granite

Intrusive Igneous Rock

Granite

Felsic intrusive igneous rock

Tumbled pink feldspar-rich stone, likely granite or microcline

Feldspar-dominant granitoid; probable potassium feldspar (orthoclase/microcline, KAlSi₃O₈) with quartz and minor iron-stained minerals

Granite (likely weathered cobble)

Granite; chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende

Sandstone (Ferruginous)

Arenite with Iron Oxide cement

Polished serpentine or green jasper pebble

Likely serpentine-group silicate, chiefly antigorite/lizardite; possibly iron-rich jasper

Tumbled gray stone, likely serpentinite or weathered basalt

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

Unknown Organic Object (likely a berry or fruit)

Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.