This Is Not A Rock Or Mineral

Granite

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

Stichtite in Serpentinite (Atlantisite)

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

Likely quartz-rich rock fragment

Indeterminate; possibly quartz-bearing granite or quartzite

Goldstone (aventurine glass)

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

N/A (Non-Geological Object)

Small tan stone (undetermined)

Unidentified fine-grained geological material; species cannot be determined from the image

Polished black tourmaline (probable schorl)

Schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Carnelian

Carnelian (Microcrystalline Quartz, SiO2)

Small pale stone fragment (undetermined)

Unidentified; the image lacks diagnostic detail for a reliable identification

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

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

Metamorphic rock outcrop, likely schist or gneiss

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

Man-made Synthetic Material (Plastic/Composite)

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

Likely banded gneiss fragment

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

Shale or Siltstone

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

Pearl necklace

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

Quartz (Druzy)

Silicon Dioxide (SiO2)

Weathered quartz-bearing rock, possibly granite or pegmatite

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

Banded metamorphic rock, likely schist or gneiss

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

Biotite (Black Mica)

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

Unidentified gray rock fragment

Indeterminate from image; possibly quartz- or feldspar-rich silicate material

Polished peridot (olivine) cabochon

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

Polished opalite (likely man-made opalescent glass)

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

Note: Item is not a geological specimen

Guitar Components (Steel, Nickel, Plastic, Wood)

Quartz Druzy (on Matrix)

Silicon Dioxide (SiO2)

Druzy Quartz on Quartz Base

Silicon Dioxide (SiO2)

Likely blue-gray gneiss

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

Banded gneiss pebble

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

Granite (Pink/Red)

Phaneritic Plutonic Felsic Rock (major minerals: Quartz, Orthoclase Feldspar, Plagioclase Feldspar)

Quartz-veined altered rock

Likely quartz-bearing metasediment or altered igneous rock; vein mineral: quartz (SiO₂)

Hypersthene

Hypersthene ((Mg,Fe)SiO₃)

Yellow Calcite

Calcium Carbonate (CaCO3)

Polished dark stone fragment, possibly slate or schist

Fine-grained foliated metamorphic rock; exact mineral composition is indeterminate from the image

Serpentinite

Serpentinite (a rock composed predominantly of serpentine group minerals)

Unknown dark mineral fragment

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

Pink Feldspar

Orthoclase Feldspar (KAlSi3O8)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Unidentified rough mineral fragments

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

Iron-stained quartz-rich rock

Likely quartz with iron-oxide staining (SiO₂ with goethite/limonite); exact identification is uncertain from the photo

Sodalite

Sodalite, Na8(Al6Si6O24)Cl2

Biotite (Black Mica)

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

Likely raw quartz-bearing stone, possibly greenish quartz or calcite

Uncertain from photograph; possible quartz (SiO₂) or calcite (CaCO₃)