Sedimentary Like (Industrial Composite)

Sandstone

Arenite (primarily composed of SiO2)

Red Swirl Beads (Likely Resin or Glass, simulating Red Jasper or Agate)

N/A (for the beads as pictured); Red Jasper: SiO2 (Chert variety); Red Agate: SiO2 (Chalcedony variety)

Ruby

Corundum (Al2O3:Cr)

Tumbled Clear Quartz and Citrine Points

Silicon Dioxide (SiO2)

Rounded reddish-brown pebble

Likely ferruginous sandstone or iron-rich quartzite; exact identification requires a fresh surface and tests

Weathered river pebble, likely quartz-rich sandstone or iron-stained quartzite

Provisional identification: quartz-rich sandstone/quartzite; exact composition cannot be confirmed from the image

Rounded river cobble, likely weathered sandstone or quartz-rich metasandstone

Indeterminate sandstone; commonly quartz (SiO₂) with feldspar, lithic grains, and iron-oxide cement

Limestone

Calcium Carbonate (CaCO3)

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Chert (Flint)

Chert (SiO2)

Garnet (Almandine)

Almandine, Fe3Al2Si3O12

Native Copper (Penny specimen)

Native Copper (Cu)

Mica Schist

Mica Schist

Fluorite (left), Sodalite (middle), Dumortierite/Tumbled Quartzite (right)

Calcium Fluoride (CaF2), Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2), Aluminum Borosilicate (Al7(BO3)(SiO4)3O3)

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Blue glass-like tumbled specimen

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

Black Tourmaline

Schorl (Sodium iron aluminum boron silicate hydroxide)

Mica Schist with Quartz

Mica Schist (primarily Muscovite or Biotite with Quartz)

Bismuth Crystal

Bismuth (element symbol Bi, atomic number 83)

Schist

Schist (Crystalline Metamorphic Rock)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Banded Agate (specifically Sardonyx or Red Agate)

Silicon Dioxide (SiO2)

Orange Quartzite (River Pebble)

Quartzite (SiO2 with iron oxide inclusions)

Anthracite Coal

Anthracite

Schist (Garnet-Mica Schist)

Garnet-Mica Schist

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Cone-in-cone structure (Limestone)

Cone-in-cone structure (Secondary Sedimentary Structure)

Blue-green calcite (likely aragonite or apatite alternative)

Calcite, CaCO₃

Sandstone

Arenite (SiO2 primarily)

Cubic Zirconia

Zirconium Dioxide (ZrO2)

Diamond

Carbon (C)

Limestone

Calcium Carbonate (CaCO3)

Green Druzy Quartz (Prasiolite)

Silicon Dioxide (SiO2) with inclusions (typically Chlorite or Actinolite)

Basalt with Iron Oxide staining

Basalt (Mafic volcanic rock)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Epidote in Basalt

Epidotized Basalt (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH) in Mafic Igneous Host)

Quartz Pebble

Silicon Dioxide (SiO2)

Pink Garnet in Matrix

Grossular or Almandine Garnet (X3Y2(SiO4)3)

Dyed Quartz (often sold as 'Blue Quartz' or 'Blue Agate')

Silicon Dioxide (SiO2) with artificial pigment

Rough Diamond

Diamond (pure Carbon, C)

Schist

Mica Schist (Metamorphic Rock)