Not A Rock

River Quartzite Siltstone

Quartz-rich Meta-siltstone (SiO2 dominated)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic silicate with secondary mineral inclusions)

Sandstone (Quartz-rich)

Clastic sedimentary rock (SiO2 primary)

Orbicular Granite

Orbicular Granidiorite / Plutonic Igneous Rock

Sandstone (lithic wacke/arenite)

Clastic sedimentary rock (primarily SiO2)

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (Lithic Sandstone)

Sandstone

Arenite (primarily SiO2)

Sandstone (likely Arkosic or Quartzose)

Arenite (SiO2 based with mineral inclusions)

Basalt

Basalt (Aphanitic Mafic Volcanic Rock)

Diamond Druzy (Crystalline Diamond)

Carbon (C)

Quartzite (Pink/Red variety)

Quartzite (SiO2 with iron oxide impurities)

Limestone (specifically Dolomitic Limestone)

Calcium Magnesium Carbonate (CaMg(CO3)2)

Limestone with Quartz/Calcite Veins

Sedimentary Limestone (CaCO3 with SiO2 or CaCO3 intrusions)

Chert (Chalcedony/Agate)

Microcrystalline Quartz (SiO2)

Coral Fossil (Petrified Coral)

Scleractinia (Order) - Calcified Fossil Skeleton (CaCO3)

Basalt

Mafic Igneous Rock (composed of plagioclase feldspar and pyroxene)

Basalt

Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)

Serpentinite

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

Pumice

Pumice (volcanic glass foam)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Sandstone with Ironstone Banding

Clastic Sandstone (composed of Quartz with Hematite/Limonite bonding)

Quartzite pebble

Quartzite (primarily SiO2)

Porphyritic Basalt

Porphyritic Basalt (containing Plagioclase or Alkali Feldspar phenocrysts)

Snowflake Obsidian

Volcanic glass (SiO2) with Cristobalite (SiO2) inclusions

Basalt

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Clear Quartz

Silicon Dioxide (SiO2)

Amygdaloidal Basalt

Basalt with secondary amygdule minerals (likely Epidote or Chlorite)

Basalt

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

Quartzite with Feldspar

Quartzite (mainly SiO2) with inclusions of Potassium Feldspar (KAlSi3O8)

Red Quartz (Druzy)

Silicon Dioxide (SiO2) with Hematite inclusions

Quartz Druzy Geode Fragment

Silicon Dioxide (SiO2)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

Petoskey Stone

Hexagonaria percarinata (Fossilized Coral)

Sandstone

Arenite

Quartz (Druzy/Macro-crystalline)

Silicon Dioxide (SiO2)

Biotite Schist

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

Quartz / Quartzite

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Chert (varietal: Flint Pitted Pebble)

Cryptocrystalline Quartz (SiO2)

Pink Granite

Felsic intrusive igneous rock (composition: SiO2 and Al2O3)

Andesite

Andesite