Sedimentary Or Metamorphic (Base Substrate)

Mica Schist or Muscovite

KAl2(AlSi3O10)(OH)2

Labradorite

(Ca,Na)(Al,Si)4O8

Labradorite (likely)

(Ca,Na)(Al,Si)4O8

Fossilized Sea Urchin Spines

Echinoidea (Cidaroid spines)

Sandstone

Arenite (SiO2 based)

Fossiliferous Limestone

Carbonate sedimentary rock (CaCO3)

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Quartzite Conglomerate

Conglomerate (clastic sedimentary rock)

Muscovite Mica

KAl2(AlSi3O10)(OH)2

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Hag Stone (Holed Quartzite Pebble)

Quartzite (SiO2 based) with natural vug or erosion hole

Quartz / Quartz Cluster

Silicon Dioxide (SiO2)

Conglomerate

Sedimentary Conglomerate

Serpentine

Serpentine Group (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al)2O5(OH)4

Lepidolite in Pegmatite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lepidolite)

Mica Schist with Quartz

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Mica Schist

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

Lepidolite in Quartz (Obelisk)

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lepidolite)

Zoisite with Ruby (Anyolite)

Zoisite – Ca2Al3(SiO4)3(OH) with inclusions of Ruby (Al2O3:Cr)

Mica schist, likely biotite–muscovite schist

Mica schist; predominantly quartz, feldspar, biotite and/or muscovite mica. Exact mineral composition cannot be confirmed from the photograph alone.

Siltstone Pebble with Veining

Siltstone

Ruby (Cabochon)

Corundum (Al2O3)

Sandstone

Arenite (SiO2 principal)

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Sandstone River Cobble

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Epidotite (Unakite variety)

Epidotized Granite (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Mica Schist

Schist (muscovite/biotite rich)

Biotite in Host Matrix

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

Muscovite Mica (with Quartz)

Muscovite (KAl2(AlSi3O10)(OH)2)

Milky Quartz with Chlorite Schist Inclusions

Quartz (SiO2) with Chlorite Group silicates (typically (Mg,Fe)3(Si,Al)4O10(OH)2)

Muscovite Schist with Quartz

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

Chert (Field Stone)

Microcrystalline Quartz (SiO2)

Laterite Gravel with Quartz

Ferruginous Laterite (Fe2O3·nH2O)

Blue Apatite

Apatite (Group), Ca5(PO4)3(F,Cl,OH)

Quartzite Conglomerate

Conglomerate (SiO2 rich)

Biotite Mica in Host Rock

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

Possible weathered mica-rich metamorphic fragment

Mica schist or phyllite (quartz–mica assemblage; identification uncertain from image)

Epidosite (Epidote-rich rock)

Epidosite (consisting primarily of Epidote: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Sandstone

Arenite (SiO2 based)

Muscovite Mica

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