Organic (Geological Relative)

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

Chert (microcrystalline quartz)

Fluorite in Matrix

Fluorite (CaF2) within a host rock matrix

Dendritic Opal (Common Opal)

Amorphous Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions

Red Jasper (beads)

SiO₂ (Silicon Dioxide)

Ironstone Concretion (Limonite/Hematite Nodules)

Ironstone (principally Limonite FeO(OH)·nH2O or Hematite Fe2O3 mixed with silica/clay)

Wood Beads (Palmwood/Ebony)

Various species for wood, but often refers to woods like Palmwood (e.g., Borassus flabellifer) or Ebony (Diospyros spp.) for their distinctive grain and hardness.

Rose Quartz Carving

Quartum roseum (Variety of Quartz, SiO2)

Banded malachite cabochon

Malachite, Cu₂CO₃(OH)₂; the dark bands may be manganese-oxide or other sulfide-rich matrix, and could also indicate a composite or treated specimen

Rose Quartz

Quartz (SiO2) with trace impurities causing pink color

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Granite

Granite (a felsic intrusive igneous rock)

Mica (likely Muscovite)

Muscovite / KAl2(AlSi3O10)(OH)2

Serpentinite

Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)

Amazonite

Amazonite (KAlSi3O8)

Graphite-veined Quartzite

Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)

Mother of Pearl (Nacre)

Calcium Carbonate (primarily aragonite, with conchiolin)

Limonite (Iron Ore)

Hydrous Iron Oxide (goethite, lepidocrocite)

Shale

Shale (clastic sedimentary rock)

Popcorn

Zea mays everta (P. Wilson) (Botanical name for the corn variety)

Caliche (also known as hardpan, calcrete, kankar)

Primarily composed of calcium carbonate (CaCO₃), often mixed with other minerals like quartz, clay minerals, and iron oxides.

Petrified Wood

Silicified wood (primarily SiO2)

Peridot (likely, based on color and appearance)

Olivine group mineral, specifically (Mg,Fe)2SiO4 (Forsterite-Fayalite solid solution series)

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Dendritic Agate (or Dendritic Opal)

SiO2 (for Agate), SiO2·nH2O (for Opal)

Hand-Drawn Gengar Pokémon Card Artist Item

Lignocellulosic Fiber (Cellulose, C6H10O5) with wax-based pigment (crayon/colored pencil)

Petrified Wood

Silicified Wood / Fossilized Wood (SiO2)

Shale with Vein Infillings

Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.

Concretion

Various mineral compositions, typically carbonate or iron oxide cemented sediment

Fossilized Wood (Petrified Wood)

Silicified Wood (primarily quartz/chalcedony replacing organic matter)

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2

Chert (varietal: Jasper or Flint likely, but definitive identification is difficult from image)

SiO₂ (silicon dioxide)

Pyrite

Pyrite (Iron Disulfide), FeS2

Chert / Flint

Chert (varietal name for microcrystalline quartz). Chemical formula: SiO₂

Granite

Granite (a felsic intrusive igneous rock)

Asphalt

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

Shale or Mudstone (Based on appearance)

Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)

Rhodonite

Rhodonite (MnSiO3)

Rounded gray limestone pebble with a calcite vein

Calcitic limestone, composed predominantly of calcite (CaCO₃), locally cut by a white calcite vein

Aquamarine

Beryl (Be3Al2Si6O18), specifically the blue-green variety

Banded Chert

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

Pearl

Calcium Carbonate (Aragonite or Calcite) and Conchiolin

Biological Specimen (Domestic Dog)

Canis lupus familiaris