Not A Rock (Man Made Industrial Metal)

Quartzite

Quartzite (primarily SiO2)

Milky Quartz (Crystal Cluster)

Silicon Dioxide (SiO2) - Quartz Variety

Marble

Recrystallized Calcite (CaCO3) Rock

Basalt

Basalt (Mafic volcanic rock)

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Marble

Recrystallized Calcite Rock (CaCO3)

Quartzite

Metamorphic rock (primarily SiO2)

Crushed Limestone

Sedimentary Carbonate Rock (CaCO3)

Pumice

Pumice (a highly vesicular, silicic volcanic rock)

Calcite Geode

Calcium Carbonate (CaCO3)

Granite

Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)

Jasper (Milky/Cream Variety)

Silicon Dioxide (SiO2) - variety of Chalcedony

Diabase (Dolerite) Cobble

Diabase / Dolerite

Unknown Organic Object (likely a berry or fruit)

Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.

Anthracite Coal

Anthracite (Carbon-rich metamorphic rock)

Garnet in Matrix (likely Almandine in Quartz/Mica Schist)

Almandine Garnet (Fe3Al2(SiO4)3) in Quartz-Feldspar host rock

Green Druzy Quartz (Prasiolite)

Silicon Dioxide (SiO2) with inclusions (typically Chlorite or Actinolite)

Quartz Geode

Silicon Dioxide (SiO2)

Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Golden Healer Quartz

Ferruginous Quartz (SiO2 with Fe2O3 inclusions)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)

Slate

Slate (Metamorphic Rock)

Quartzite

Quartzite (primarily SiO2)

Serpentine

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

Granite

Granite (phaneritic intrusive igneous rock consisting mainly of quartz, alkali feldspar, and plagioclase)

White Agate (Chalcedony)

Silicon Dioxide (SiO2)

Citrine (Iron-stained Quartz)

Silicon Dioxide (SiO2)

Quartz Geode in Sedimentary Matrix

Silicon Dioxide (SiO2) within a limestone/dolostone host

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix

Olivine (Peridotite)

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

Quartzite River Rock

Quartzite (SiO2)

Andesite

Intermediate Volcanic Rock (Andesite)

Quartzite

Quartzite (SiO2)

Eclogite

Eclogite (composed primarily of Omphacite and Pyrope Garnet)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2 - Muscovite component)

Serpentinite

Serpentinite (containing minerals of the Serpentine subgroup: Antigorite, Lizardite, and Chrysotile; formula (Mg,Fe)3Si2O5(OH)4)

Dragon Vein Agate

Silicon Dioxide (SiO2)

Yellow Quartzite

Quartzite (primarily Silicon Dioxide - SiO2)

Quartzite

Quartzite (primarily SiO2)