Mineral, Specifically A Rock Fragment

Bivalve Fossil (Shell Fragment)

Class Bivalvia (Calcium Carbonate - CaCO3)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Chert (specifically Chalcedony/Flint variant)

Silicon Dioxide (SiO2)

Fossilized Bone Fragment

Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Fossilized Bone Fragment

Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)

N/A - Image does not contain a rock or mineral

Anthropogenic textile material

Graywacke

Graywacke

Granite fragment

Phaneritic Igneous Rock (Granitic composition)

Quartz Pebble

Silicon Dioxide (SiO2)

Limestone (specifically Fossiliferous or Crinoidal Limestone)

Calcium Carbonate (CaCO3) - Calcite Rock

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Pallasite Meteorite

Pallasite (Stony-iron meteorite; Fe-Ni alloy with (Mg,Fe)2SiO4 olivine)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Quartz in Matrix (possibly with Biotite or Hornblende)

Quartz (Silicon Dioxide, SiO2) in Granitic Matrix

Chipped Glass/Plastic Fragment

Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic

Pebble (likely Sandstone or Granitic Pebble)

Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)

Chert (Nodule / Geode fragment)

Microcrystalline Quartz (SiO2)

Unidentifiable Specimen

Undetermined

Agate (or Banded Agate)

Agate (a variety of Chalcedony, which is a cryptocrystalline form of Quartz); Chemical Formula: SiO₂ (Silicon Dioxide)

Chert (specifically Tan/Yellow Chert)

Silicon Dioxide (SiO2)

Sandstone (Greywacke)

Arenite / Wacke (Mainly SiO2 with various lithic fragments)

Eclogite

Eclogite

Quartz (Gravel fragment)

Quartz (Silicon Dioxide, SiO2)

Citrine Geode Fragment

Citrine (Silicon Dioxide with Iron Impurities), SiO2

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

Quartz (likely Herkimer Diamond style)

Silicon Dioxide (SiO2)

Labradorite

(Ca, Na)(Al, Si)4O8

Quartz (Quartzite fragment)

Silicon Dioxide (SiO2)

Smoky Quartz and Chalcedony Geode Fragment

Silicon Dioxide (SiO2)

Quartz (likely Clear Quartz or Rock Crystal)

Quartz (SiO2)

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Note: Item is not a geological specimen

Guitar Components (Steel, Nickel, Plastic, Wood)

Note: This is a Man-Made Object (Costume/Prop Patch)

Synthetic fiber and pigments (Cellulose/Plastic-based composite)

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-feldspar, Quartz, and Biotite)

Granite

Granite (Felsic Plutonic Rock)

Dinosaur Bone (Gembone)

Petrified Dinosaur Bone (Apatite/Silica replacement)

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Yellow Quartz (Citrine or Iron-Stained Quartz)

Silicon Dioxide (SiO2)

Chert (Gravel Bit)

Microcrystalline silica (SiO2)

Mica-rich Schist fragment

Mica Schist

Quartz (likely) or a Quartzite Pebble

Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.