Mineral, Part Of A Rock

Greenstone / Serpentinite

Serpentinite (composed primarily of minerals from the serpentine group Mg3Si2O5(OH)4)

Yellow Chert (Jasper)

Microcrystalline Quartz (SiO2)

Schist

Mica Schist

Dendritic Siltstone (or Mudstone)

Siltstone with Manganese Oxide dendrites

Diorite

Phaneritic intermediate plutonic rock

Prehnite on Basalt

Prehnite - Ca2Al(AlSi3O10)(OH)2

Chert / Flint

Cryptocrystalline quartz (SiO2)

Gabbro

Gabbro (Mafic Plutonic Rock)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Turquoise

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

Sandstone (Green/Yellow Siltstone variant)

Arenite or Siltstone (primarily SiO2 with mineral staining)

Asphalt (Bituminous Concrete)

Bituminous Concrete / Pavement

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Granular)

Silicon Dioxide (SiO2)

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.

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Drupa Quartz (Sparkly Drusy Quartz on Matrix)

Crystalline Silicon Dioxide (SiO2) on host rock

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz/Clear Quartz Cluster

Silicon Dioxide (SiO2)

Turquoise

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

Sandstone (Quartzite Pebble)

Arenite (primarily SiO2)

Jasper with Quartz inclusions

Silicon Dioxide (SiO2)

Prehnite

Ca2Al(AlSi3O10)(OH)2 (Calcium Aluminum Silicate hydroxide)

Milky Quartz with Mineral Inclusions

Silicon Dioxide (SiO2) with miscellaneous inclusions

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Red Sandstone

Arenite (primarily Quartz SiO2 with Hematite Fe2O3 cement)

Quartz

Silicon Dioxide (SiO2)

Sandstone (lithic/greywacke variety)

Arenite (composed primarily of SiO2 with various lithic fragments)

Sandstone

Arenite (primarily SiO2 with various cementing agents)

Moss Agate

Chalcedony (Silicon Dioxide) with dendritic inclusions (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Red Sandstone

Arenite (Fe2O3-rich)

Granitic Quartz with Feldspar

Granite (composed primarily of SiO2 and KAlSi3O8)

Granite (including Pegmatite variants)

Phaneritic Plutonic Rock (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Biotite/Muscovite mica)

Vesicular Basalt with Amygdules

Amygdaloidal Basalt

Chert with Quartz Veining

Silicon Dioxide (SiO2)

Turquoise (Green variety)

Hydrous phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O

Gneiss (High-Grade Metamorphic Rock)

Gneiss (primarily composed of Quartz, Feldspar, and Mica/Amphiboles)

Sandstone (likely Quartzose)

Arenite (SiO2 principal mineral)

Milky Quartz

Silicon Dioxide (SiO2)