Organic Crystal (Mineraloid)

Asphalt

Asphalt concrete (engineered material, not a naturally occurring rock/mineral in this form)

Cherry Creek Jasper (also known as Red Creek Jasper or Cherry Creek Agate)

Jasper, microcrystalline quartz (SiO₂)

Mookaite Jasper

Siliceous (chert) sedimentary rock, a form of Jasper

Chert (varietal known as Jasper or Flint)

Silicon Dioxide (SiO2)

Pyrite

Iron Pyrite (FeS2)

Banded Chert

Chert (a microcrystalline variety of quartz, SiO2 with minor impurities)

Coal (specifically Bituminous or Anthracite)

Organic sedimentary rock; primarily Carbon (C) with varying H, S, O, N

Petrified Wood

Silicified Wood (SiO2)

Pyrite

Pyrite (Iron Disulfide), FeS2

Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)

Chert (microcrystalline quartz)

Petrified Wood

Silicified wood, primarily composed of Quartz (SiO2)

Coral (Precious Coral)

Corallium rubrum (Red Coral), Paracorallium japonicum (Momo Coral), Pleurocorallium elatius (Sardinian Coral), various other species within the Corallidae family. Chemically, it's primarily Calcium Carbonate (CaCO 3 ).

Coal (most likely Bituminous or Anthracite)

Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)

Travertine (used in construction, not a 'specimen' in situ)

Travertine

Shale or Argillite

Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)

Shale

Shale (clastic sedimentary rock)

Shale or Argillite

Shale (sedimentary) / Argillite (metamorphic)

Petrified Wood

Silicified wood (Quartz/Chalcedony)

Baltic Amber (Butterscotch or Egg Yolk Variety)

Fossilized Tree Resin (Succinite); Approximate formula: C10H16O

Opalite (a synthetic glass, often confused with Opal)

Silicon dioxide glass (SiO2nH2O, for natural opal)

Pyrite

Pyrite (Iron sulfide, FeS₂)

Chalcedony Geode

Chalcedony (SiO2) within a geode structure

Amber

Fossilized tree resin (not a true mineral as it is organic and amorphous); Chemical formula is highly variable, but often approximated as C10H16O.

Anthracite Coal

Anthracite (Carbon-based organic sedimentary rock exposed to metamorphic heat/pressure; Chemical composition is approximately 86%–98% Carbon)

Baroque Pearl (and potentially a small Sapphire/Blue Topaz)

Pearl: Calcium Carbonate (aragonite or calcite) with conchiolin. Sapphire: Aluminum Oxide (Al2O3). Blue Topaz: Al2SiO4(F,OH)2.

Baltic Amber (Butterscotch or Egg Yolk Variety)

Succinite (C10H16O)

Ambergris (Sea Wax)

Physeter macrocephalus fecalith

Shale (possibly)

Shale (fine-grained clastic sedimentary rock)

Red Coral

Corallium rubrum (for precious red coral), although other species like Corallium japonicum and Paracorallium are also used.

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)

Mixed River Pebbles

Clastic Sedimentary Alluvial Deposit / Polymictic Conglomerate Clasts

Granite Pegmatite

Granitic Pegmatite (composition: SiO2 with KAlSi3O8)

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

Intrusive Igneous Rock

Granite

Phaneritic felsic intrusive igneous rock

Rhyolite

Extrusive Felsic Igneous Rock

Granite

Plutonic Igneous Rock

Pegmatite (Granitic)

Granitic Pegmatite containing Quartz, Feldspar, and Tourmaline (Schorl)

Granite

Intrusive Igneous Rock

Granite

Intrusive Igneous Rock

Granite

Intrusive Igneous Rock

Granite

Felsic intrusive igneous rock