Sedimentary Or Metamorphic (Base Substrate)

River Cobble (likely Serpentinite or Greenstone)

Serpentinite / Greenschist facies rock

Quartzite Cobble / Quartz River Pebble

Silicon Dioxide (SiO2) - Quartzite / Quartz

Epidote

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

Biotite (Mica)

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

Emerald in Matrix

Emerald (variety of Beryl) - Be3Al2(SiO3)6

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(F,OH)2)

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Anthracite Coal

Anthracite (Carbon-based solid)

Quartzite Pebble

Metamorphic Quartzite (primarily SiO2)

Rainbow Moonstone with Black Tourmaline

White Labradorite with Schorl (Na,Ca)(Al,Si)4O8

Eclipse Stone (Kabamba Jasper)

Rhyolite with Aegirine (NaFe3+Si2O6)

Cinnabar in Dolomite or Quartz (Cinnabrite)

Mercury sulfide (HgS) in Dolomite (CaMg(CO3)2)

Pebble / Gravel

Clastic Sedimentary Specimen (likely Limestone or Quartzite base)

Milky Quartz

Silicon Dioxide (SiO2)

Biotite Schist

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

Schist (Oxidized)

Mica Schist with Iron Oxide staining

Slate

Foliated Metamorphic Rock

Jasper in Quartzite (likely Cinnabar or Iron inclusions)

Silicon dioxide (SiO2) with impurities

Fuchsite

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

Muscovite Mica

Muscovite (Potassium Aluminum Silicate Hydroxide), KAl2(AlSi3O10)(OH)2

Muscovite Mica

Muscovite KAl2(AlSi3O10)(OH)2

Glauconitic Sandstone (Greensand)

Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)

Beryl (Aquamarine) in Matrix with Schorl

Be3Al2Si6O18 (Beryl) with NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)

Citrine

SiO2 (Silicon Dioxide)

Muscovite Mica

KAl2(AlSi3O10)(F,OH)2

Milky Quartz Vein in Mafic Rock

Quartzite vein in Metabasalt (SiO2 base)

Quartzite River Rock

Quartzite (SiO2 based metamorphic rock)

Anthracite Coal

Anthracite (Carbon-based metamorphic rock)

Slate

Phyllo-silicate based metamorphic rock

Schist

Mica Schist (Metamorphic Rock)

Peacock Ore (Bornite or Chalcopyrite treated with acid)

Bornite (Cu5FeS4) or Acid-washed Chalcopyrite (CuFeS2)

Quartzite (Iron-stained River Rock)

Metamorphic Rock consisting primarily of Quartz (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Quartzite

Quartzite (SiO2)

Pink Granite

Phaneritic Granitoid

Greenschist

Greenschist facies metamorphic rock

Sandstone Pebble

Sedimentary Rock (Quartzose Sandstone)

Muscovite Mica

Muscovite [KAl2(AlSi3O10)(OH)2]

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Lapis Lazuli (in jewelry setting)

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite-rich rock)

Sandstone

Arenite (SiO2 based)