Sedimentary Or Metamorphic (Base Substrate)

Sandstone (with minor quartz and possible clay components)

Clastic Sedimentary Rock (SiO2 dominated)

Milky Quartz with Mica (Gneiss/Schist influence)

Silicon Dioxide (SiO2) with Phyllosilicates

Crushed Limestone

Calcium Carbonate (CaCO3)

Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)

Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.

River Pebble Gravel

Hydrothermally modified Clastic Sediment (mainly Quartzite and Chert)

Breccia

Clastic Breccia (SiO2/CaCO3 dominated)

Zebra Stone (Silicified Siltstone)

Silicified Siltstone with Quartz/Kaolinite inclusions

Rough Ruby

Corundum (Al2O3 with Chromium impurities)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Shatter Cone (Impactite)

Shock-metamorphosed rock

Biotite Schist

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

Mica Schist

Mica Schist (primarily Muscovite or Biotite Schist)

Serpentinite

Serpentinite (composed mainly of Group: Serpentine; (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Mica Schist

Mica Schist (Complex Silicate Rock)

Sandstone (likely Greywacke variant)

Arenite

Rough Gemstone Grains (Mixed Sapphires and Quartz)

Corundum (Al2O3) and Quartz (SiO2)

Blue Sapphire

Corundum (Al2O3)

Schist

Mica Schist (contains muscovite/biotite and quartz)

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Conglomerate (Red Sandstone variety)

Clastic Sedimentary Rock (Conglomeratic Sandstone)

Conglomerate

Conglomerate (Clastic sedimentary rock)

Conglomerate

Clastic sedimentary rock (Conglomerate)

Conglomerate

Conglomerate (Clastic Sedimentary Rock)

Granitic Pegmatite (Muscovite and Quartz)

Pegmatite (KAl2(AlSi3O10)(OH)2 / SiO2)

Quartzite

Quartzite (SiO2)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Limestone

Carbonate rock (CaCO3)

Ferruginous Quartz (Iron-stained Quartzite)

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Greenstone (Epidisite / Chlorite Schist)

Metabasalt (often contains Epidote Ca2Al2(Fe3+,Al)(SiO4)(Si2O7)O(OH) and Chlorite)

Sandstone with Manganese Dendrites

Clastic Sedimentary Rock (SiO2 based with MnO2 inclusions)

Schist

Mica Schist

Fuchsite (Green Muscovite in Quartz)

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Bituminous Coal

Organic Sedimentary Rock (Carbon-based)

Sandstone (Graywacke)

Arenite / Graywacke (SiO2 with lithic fragments)

Limestone (specifically Grainstone or Micrite)

Calcium Carbonate (CaCO3)

Limestone

Sedimentary Calcite (CaCO3)

Schist

Mica Schist

Serpentine

Serpentinite (group of minerals: (Mg,Fe,Ni,Al)3Si2O5(OH)4)

Sandstone (Quartz-rich)

Arenite

Quartzite

Hydrothermal Quartz or Quartzite (SiO2)