Sedimentary And Metamorphic Minerals

Quartz (Milky/Common variant)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite (River Pebble)

Metamorphosed sandstone (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (specifically Milky/Gray Quartz)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Schist

Mica Schist (Quartz-Muscovite-Biotite Schist)

Schist

Mica Schist

Schist

Mica Schist

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Vein in Sedimentary Matrix

Silicon Dioxide (SiO2) with host rock

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Quartz (Peach/Orange variety)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal Fragments)

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Magnetite / Iron Ore

Magnetite (Fe3O4)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Sandstone (Quartzose Pebble)

Clastic Sedimentary Rock (Litharenite/Quartz arenite)

Sandstone (with Iron Staining)

Clastic sedimentary rock (SiO2 with Fe2O3 oxides)

Sandstone (Ferruginous)

Arenite (with high iron oxide content)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

River Cobble (likely Basalt or Metagraywacke)

Non-specific water-worn lithic fragment

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Sandstone

Arenite (Siliclastic sedimentary rock), SiO2 + various minerals

Limonite Sandstone

Ferruginous Sandstone (Hydrated Iron Oxide)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Jadeite (Jade)

NaAlSi2O6 (Sodium Aluminum Silicate)

Mixed Mineral Specimens

Mixed Silicates, Oxides, and Phosphates (SiO₂, Ca₅(PO₄)₃(F,Cl,OH), Na₈Al₆Si₆O₂₄Cl₂, etc.)

Greenstone (Greenschist facies)

Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)

Nuummite

Nuummite (Orthoamphibole rock composed of Anthophyllite and Gedrite, (Mg,Fe)7Si8O22(OH)2)

Nephrite Jade

Tremolite-Actinolite solid solution, Ca2(Mg,Fe)5Si8O22(OH)2

Quartzite River Rock

Quartzite (primarily SiO2)