Not A Rock Or Mineral

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Carved orange coral (likely bamboo coral)

Calcareous coral, principally aragonite (CaCO₃); possibly dyed bamboo coral, Isididae

Pink Granite / K-Feldspar

Alkali feldspar granite / Potassium feldspar (Microcline/Orthoclase)

Green glass sphere/marble

Soda-lime glass (primarily SiO2, Na2O, CaO)

Garnet Schist

Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)

Polished yellow-green pebble, possibly serpentine-rich stone

Unidentified fine-grained silicate rock; serpentine minerals (approx. Mg₃Si₂O₅(OH)₄) are a possibility

Amber beads

Amber, fossilized plant resin; largely polymerized terpenoid resin (not a mineral)

Man-made Ceramic / Clay Figurine

Aluminosilicate Ceramic (Processed Clay)

Tumbled pale-green stone, possibly serpentine

Indeterminate; appearance is consistent with serpentine-rich rock (serpentine minerals, approximately Mg₃Si₂O₅(OH)₄)

Biotite mica

Biotite, a potassium–iron–magnesium phyllosilicate mica; approximate formula K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂

Granite (Alkali-feldspar Granite)

Felsic Plutonic Rock (Primary minerals: Quartz SiO2, Orthoclase KAlSi3O8, Plagioclase (Na,Ca)AlSi3O8)

Sandstone with Iron Oxide (Limonite/Hematite)

Ferruginous Sandstone (SiO2 with FeO(OH)·nH2O)

Biotite Mica

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

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)

Biotite Mica

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

Weathered geode or vug-bearing rock

Likely a quartz- or calcite-lined geode/vug in a host rock; exact minerals cannot be confirmed from the image

Brecciated marble (decorative stone slab)

Calcite-rich marble breccia; chiefly calcite (CaCO₃), potentially with dolomite and minor iron oxides

Tumbled or naturally weathered quartz-rich stone, possibly iron-stained quartz

Quartz (SiO₂), with yellow-brown iron-oxide staining; exact identification is uncertain from the photograph

Epidote

Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Biotite Mica in Host Rock

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

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminium phosphate)

Biotite (Black Mica)

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

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Tumbled quartz-bearing rock, possibly garnet-bearing quartzite

Quartz-dominant silicate rock; visible minerals may include quartz, iron oxides, and dark mica or amphibole

Limestone with Calcite Veins

Calcium Carbonate (CaCO3)

Tumbled Mineral Collection (Amethyst, Celestite, K2 Jasper, Rose Quartz, Ruby in Zoisite, Que Sera Stone)

Mixed Mineral Specimens (Quartz SiO2, Celestite SrSO4, Corundum Al2O3 with Zoisite, etc.)

Quartz-rich pegmatitic rock with possible epidote or chlorite

Hydrothermal/pegmatitic quartz-bearing rock; identifiable minerals may include quartz (SiO₂), feldspar, and epidote/chlorite

Quartz Geode

Silicon Dioxide (SiO2) in Geodic cavity

Howlite (polished/tumbled)

Howlite, Ca₂B₅SiO₉(OH)₅

Amygdaloidal Basalt

Amygdaloidal Basalt with Secondary Infilling (e.g., Agate, Quartz, or Zeolite)

Zebra Stone

Siltstone (Argillaceous Siltstone)

Druzy Quartz on Matrix

Silicon Dioxide (SiO2)

K-Feldspar (Potassium Feldspar)

Orthoclase / Microcline (KAlSi3O8)

Montana Moss Agate

Chalcedony (SiO2) with Manganese/Iron oxide inclusions

Breccia

Sedimentary Breccia

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Iron-stained quartz-rich rock (likely limonite-bearing quartzite)

Quartzite, predominantly quartz (SiO₂), with iron oxides/hydroxides such as limonite/goethite

Biotite (Mica)

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

Serpentine (Serpentinite)

Serpentinite / (Mg,Fe)3Si2O5(OH)4

Greywacke with Quartz Veins

Lithic Sandstone (Greywacke) with SiO2 inclusions

Amygdaloidal Basalt

Vesicular-Amygdaloidal Basalt (Mafic Extrusive)

Tumbled milky quartz with iron staining

Quartz, silicon dioxide (SiO₂), likely massive quartz or quartz vein material