Sedimentary Or Metamorphic (Base Substrate)

Muscovite Mica in Quartz Matrix

Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz (SiO2)

Chert (Jasper)

Microcrystalline quartz (SiO2)

White Onyx (Marble Onyx)

Calcite (CaCO3) - Banded Calcium Carbonate

Concrete rubble

Anthropogenic conglomerate

Asphalt (Aggregate)

Bituminous macadam / Concrete Aggregate

Quartz-veined Siltstone/Greywacke

Clastic Sedimentary Rock with Quartz Infill (SiO2 vein)

Quartzite

Quartzite (SiO2)

Riverstone (Quartzite or Siltstone cobble)

Quartzite (primarily SiO2)

Fossilized Rugose Coral

Order Rugosa (Calcium Carbonate - CaCO3)

Sandstone

Arenite (SiO2-rich)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Limestone

Calcium Carbonate (CaCO3)

Chert (Flint)

Silicon Dioxide (SiO2)

Biotite (Black Mica)

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

Botryoidal Hematite (included in Quartz/Limonite matrix)

Fe2O3 (Hematite) on Quartz (SiO2) / Limonite

Limestone

Calcium Carbonate (CaCO3)

Sandstone (likely Greywacke or Lithic Sandstone)

Arenite / Wacke

Limestone (Fossiliferous)

Calcium Carbonate (CaCO3) - Bioclastic Limestone

Limestone

Calcium Carbonate (CaCO3)

Jade (likely Nephrite Jade based on appearance)

Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)

Beryl (Emerald or Aquamarine in Matrix)

Beryllium Aluminum Silicate (Be3Al2Si6O18)

Limestone (specifically Dolomitic Limestone)

Calcium Magnesium Carbonate (CaMg(CO3)2)

Citrine (likely Heat-Treated Amethyst)

Silicon Dioxide (SiO2)

Heliotrope (Bloodstone)

Cryptocrystalline Quartz (SiO2) with inclusions of Hematite (Fe2O3)

Orbicular Jasper (Ocean Jasper variant)

Silicon Dioxide (SiO2) with iron oxide inclusions

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Conglomerate

Clastic Sedimentary (Conglomerate)

Anthracite Coal

Anthracite (high-rank coal / Carbon)

Chert (Pink and Yellow Chert)

Microcrystalline Quartz (SiO2)

Chert (Flint Nodules)

Microcrystalline quartz (SiO2)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Biotite Mica

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

Basalt (Porphyritic)

Basalt (Mafic Extrusive Igneous Rock)

Limestone

Sedimentary Rock (Calcium Carbonate, CaCO3)

Quartzite

SiO2 (Crystalline Quartz)

Sandstone

Clastic Sedimentary Rock (composed primarily of Quartz, SiO2)

Kambaba Jasper

Stromatolite / Fossilized Algae (Rhyolitic structure)

Quartz with Mica (Schist/Pegmatite fragment)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Conglomerate (or Breccia)

Clastic Sedimentary Rock (Conglomeratic)

Crushed Limestone

Sedimentary Calcium Carbonate (CaCO3)

Sandstone (River Cobble)

Clastic sedimentary rock (primarily SiO2 with various lithic fragments)