Mineral Based Human Made Alloy

White Marble

Metamorphic Limestone (CaCO3)

Sandstone

Arenite (SiO2 based)

Man-made Synthetic Material (Not a rock or mineral)

Polyester (Polyethylene terephthalate) / Faux Fur

Epidote (Greenstone)

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Granite

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

Carnelian (Red Chalcedony)

Silicon Dioxide (SiO2)

Carnelian Agate

Chalcedony (SiO2) with iron oxide inclusions

Sandstone pebble

Sandstone (siliciclastic sedimentary rock)

Amygdaloidal Basalt

Amygdaloidal Basalt

Gneiss

High-grade metamorphic rock (Gneiss)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Schist

Mica Schist

Banded Serpentine

Serpentine group (subgroup Lizardite or Antigorite) - Mg3Si2O5(OH)4

Schist

Mica Schist (Metamorphic Rock)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Chert (Yellow Jasper / Flint)

Microcrystalline Quartz (SiO2)

Quartz Vein in Matrix / Quartzite

Silicon Dioxide (SiO2) with host rock

Tumbled Flint / Chert

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Gneiss

Gneiss

Biotite Schist

Biotite Schist (Metamorphic Rock featuring K(Mg,Fe)3AlSi3O10(OH)2)

Dalmatian Stone (commonly called Dalmatian Jasper)

Peralkaline Rock (mixed Feldspar, Quartz, and Arfvedsonite)

Granite Gneiss

Gneiss (containing quartz, alkali feldspar, plagioclase, biotite/amphibole)

Mixed Gravel and Pebbles

Polylithic Alluvial Aggregate

Chert (specifically Jasper or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sedimentary Breccia

Breccia (Clastic Sedimentary Rock)

Galena

Lead Sulfide (PbS)

Tumbled Serpentinite and Rose Quartz

Serpentine group (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al)2O5(OH)4 and Quartz (SiO2)

Mica Schist with Pyrite

Mica Schist (FeS2 containing)

Potassium-Rich Silicate Clay (inferred from biological context)

Phyllosilicate group (likely Illite or Smectite within surrounding soil substrate)

Amethyst Cluster

Silicon Dioxide (SiO2) with iron impurities

Vesicular Basalt with Lichen

Vesicular Basalt

Sandstone (Ferruginous)

Arenite (Fe-oxide enriched)

Schist

Mica Schist (primarily Muscovite [KAl2(AlSi3O10)(OH)2] or Biotite)

Magnesite or Howlite (dyed or naturally patterned)

Magnesium carbonate (MgCO3) or Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Chert / Jasper

Silicon Dioxide (SiO2)

Chert (Black Chert/Flint)

Chert (Silicon Dioxide, SiO2)

Chert (Flint)

Chert (Cryptocrystalline Silicon Dioxide, SiO2)

Chert (and Limestone)

Chert (consisting of Microcrystalline Quartz, SiO2)

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert

Chert (Microcrystalline Quartz, SiO2)

Chert (specifically Gray/Blue Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)