Metamorphic Rock (Specifically A Rock Composed Of Minerals)

Biotite Mica

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

Granite

Phaneritic plutonic felsic rock (primarily Quartz, Feldspar, and Mica)

Moonstone

Orthoclase (KAlSi3O8), specifically the variety showing adularescence

Nuummite

Nuummite (Orthorhombic amphiboles: Anthophyllite and Gedrite)

Quartz (specifically Clear Quartz with iron/hematite staining)

Silicon Dioxide (SiO2)

Olivine (Peridotite)

(Mg,Fe)2SiO4 (Magnesium Iron Silicate)

River Stone (likely Mudstone or Siltstone)

Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)

Charoite

Charoite (K(Ca,Na)2Si4O10(OH,F)·nH2O)

Granodiorite

Granodiorite (containing Quartz, Plagioclase, Orthoclase, Biotite/Hornblende)

Specular Hematite (Specularite) in Matrix

Specularite (Fe2O3)

Milky Quartz with Mineral Inclusions

Silicon Dioxide (SiO2) with miscellaneous inclusions

Milky Quartz with Chlorite/Mica inclusions

Silicon Dioxide (SiO2) with inclusions

Geode with Quartz Crystal Cavity

Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix

Basalt

Extrusive Mafic Igneous Rock (composed primarily of Plagioclase, Pyroxene, and Olivine)

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Granite

Granite (a felsic intrusive igneous rock)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Magnetite

Magnetite (Fe3O4)

Moss Agate

Moss Agate (a variety of Chalcedony, SiO ₂)

Marble

Recrystallized Calcite (CaCO3) Rock

Calcite

Calcite (CaCO₃, Calcium Carbonate)

Jasper Agate (specifically Brecciated Jasper with Agate inclusions)

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2) in Geode form

Stiped Slate Beach Pebble

Low-grade Metamorphic Slate with Quartz Vein (SiO2 on Phyllosilicate base)

Garnet (almandine or pyrope variety)

Silicate mineral Group: (Fe, Mg, Mn, Ca)3(Al, Fe, Cr)2(SiO4)3

Dumortierite Quartz

Dumortierite (Al7BO3(SiO4)3O3 / inclusion in SiO2)

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Granite

Intrusive igneous rock (Acidic)

Mica (Biotite or Phlogopite variety)

Phyllosilicate (complex mineral formula involving K, Mg, Fe, Al, Si, and O)

Clear Quartz

Silicon Dioxide (SiO2)

Labradorite

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

Conglomerate

Conglomerate (Sedimentary rock)

Geode (unopened) or Calcareous Nodule

Siliceous or Calcareous Concretion/Nodule

Chert / River Pebble

Silicon Dioxide (SiO2)

River Rocks (Basalt and Sedimentary Stones)

Mafic Igneous Rock (Basalt) and Clastic Sedimentary Rock

Quartz

Quartz (SiO2 - Silicon Dioxide)

Citrine Quartz

Silicon Dioxide (SiO2)

Moonstone (Feldspar variety)

Orthoclase Feldspar (KAlSi3O8)

Quartzite

Quartzite (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Turquoise (Blue Howlite imitation)

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)