Not A Rock Or Mineral

Polished labradorite cabochon

Labradorite, calcium-rich plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈

Gold (Elemental Metal)

Gold (Au)

Likely iron-rich slag or dark ironstone

Indeterminate from photograph; possibly iron-rich industrial slag (Fe–Si–O glass/oxides) or ironstone

Quartz-veined Basalt or Limestone Pebble

Quartz vein in host rock (Silicate mineral in carbonate or volcanic matrix)

Goldstone (aventurine glass)

Synthetic copper-bearing soda-lime glass; commonly sold as red goldstone

Quartz (Druzy)

Silicon Dioxide (SiO2)

Granite

Phaneritic Felsic Igneous Rock (Main minerals: SiO2, KAlSi3O8, NaAlSi3O8)

Stichtite in Serpentinite (Atlantisite)

Mg6Cr2CO16(OH)16·4H2O in Mg3Si2O5(OH)4

Likely green bottle glass, not a geological specimen

Manufactured soda-lime silicate glass

Likely brown mica (biotite) specimen

Biotite, a potassium-iron-magnesium sheet silicate; approximate formula K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂

Unidentified rough rock fragment

Indeterminate; the image does not show enough detail for a reliable mineral or rock identification

Unidentified rough mineral fragments

Likely quartz- or feldspar-bearing rock; exact identification requires testing

Pearl necklace

Pearl: biogenic calcium carbonate, primarily aragonite (CaCO₃), in a conchiolin matrix

Unknown dark mineral fragment

Indeterminate; possibly a dark silicate mineral or slag-like geological fragment

Polished opalite (likely man-made opalescent glass)

Opalite is a commercial name, not a mineral; typically opalescent glass, often soda-lime silicate glass

Quartz Druzy (on Matrix)

Silicon Dioxide (SiO2)

Biotite (Black Mica)

Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2

Polished black tourmaline (probable schorl)

Schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Carnelian

Carnelian (Microcrystalline Quartz, SiO2)

Small rough mineral/rock specimen (not confidently identifiable)

Undetermined; image detail is insufficient for a reliable identification

Weathered dark mineral/rock fragment

Indeterminate; possibly iron-rich basalt, slag, or a sulfide-bearing mineral

Druzy Quartz on Quartz Base

Silicon Dioxide (SiO2)

Note: Item is not a geological specimen

Guitar Components (Steel, Nickel, Plastic, Wood)

Green Mica

Fuchsinite or Muscovite, KAl2(AlSi3O10)(OH)2

Kfeldspar with Quartz

Potassium Feldspar and Silicon Dioxide (KAlSi3O8 + SiO2)

Likely banded gneiss fragment

Gneiss, a foliated metamorphic rock (exact mineral identification is uncertain from the image)

Metamorphic rock outcrop, likely schist or gneiss

Foliated metamorphic rock; exact mineral assemblage cannot be determined from the image

Greenstone pebble (likely serpentinite)

Serpentinite, composed mainly of serpentine-group minerals

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

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

Banded metamorphic rock, likely schist or gneiss

Foliated quartz–feldspar–mica rock; exact mineral identification requires sampling

Shale or Siltstone

Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)

Weathered quartz-bearing rock, possibly granite or pegmatite

Likely quartz–feldspar rock; exact mineral identification is uncertain from the photograph

Polished peridot (olivine) cabochon

Olivine, typically forsterite-rich: (Mg,Fe)₂SiO₄

Weathered iron-rich rock, possibly laterite or ironstone

Indeterminate ferruginous rock; likely iron-oxide-cemented material (goethite/limonite ± hematite)

Yellow Calcite

Calcium Carbonate (CaCO3)

Man-made Synthetic Material (Plastic/Composite)

Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)

Likely blue-gray gneiss

Gneiss, a foliated metamorphic rock; exact mineral composition cannot be confirmed from the image

Tumbled banded gneiss

Gneiss, a foliated metamorphic rock; exact mineral composition cannot be determined from the image

Serpentinite

Serpentinite (a rock composed predominantly of serpentine group minerals)

Pink Feldspar

Orthoclase Feldspar (KAlSi3O8)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)