Mineral Description (Anthropogenic Material)

Serpentinite

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

Mica Schist

Mica Schist (primarily Muscovite or Biotite KAl2(AlSi3O10)(OH)2)

Coquina

Biogenic Limestone (Calcite, CaCO3)

Quartzite Pebble

Metamorphosed Sandstone (SiO2)

Biggs Jasper

Cryptocrystalline Quartz (Silicon Dioxide) - SiO2

Granite

Granite (Mainly Quartz SiO2, Feldspar KAlSi3O8, and Mica KAl2(AlSi3O10)(OH)2)

Conglomerate

Conglomerate (Clastic sedimentary rock)

Sandstone (Ferruginous)

Arenite (with Iron Oxide)

Riverstone Quartzite

Quartzite (primarily SiO2)

Quartzite (Gold/Tan River Cobble)

Quartzite (composed primarily of crystalline SiO2)

Granite (weathered cobble)

Granite

Travertine

Calcareous tufa (CaCO3)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Coquina / Shell Limestone

Coquina (Bioclastic Limestone)

Quartzite (River Pebble)

Quartzite (SiO2)

Scoria (Basaltic)

Vesicular Basalt

Jasper

Jasper (Silicon Dioxide, SiO2)

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

Chert (Jasper/Flint variant)

Microcrystalline Quartz (SiO2)

Chert (Flint Nodules)

Silicon Dioxide (SiO2)

Banded Chert

Silicon Dioxide (SiO2)

Chert (often called Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint Nodules)

Silicon Dioxide (SiO2)

Slate

Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.

Laterite (iron-rich nodule, possibly Bauxite as a subtype)

Laterite (composed of various minerals including goethite, hematite, gibbsite, etc.)

Green Agate

Silicon dioxide (SiO₂)

Coral (Precious Coral)

Corallium rubrum (Red Coral), Paracorallium japonicum (Momo Coral), Pleurocorallium elatius (Sardinian Coral), various other species within the Corallidae family. Chemically, it's primarily Calcium Carbonate (CaCO 3 ).

Chondrite Meteorite

Ordinary Chondrite (OC)

Red Jasper

Silicon Dioxide (SiO2)

Green Jasper

Silicon Dioxide (SiO2)

Granite Cobble/Pebble

Granite

Himalayan Salt

Halite (mineral name), chemical formula NaCl (sodium chloride). Generally, 'Himalayan Salt' is a trade name for evaporite minerals from specific regions.

Pumice

Pumice (Amorphous volcanic glass)

Rose Quartz

Quartz (SiO₂), specifically a variety of Quartz

Caliche (also known as hardpan, calcrete, kankar)

Primarily composed of calcium carbonate (CaCO₃), often mixed with other minerals like quartz, clay minerals, and iron oxides.

Azurite-Malachite (often a mixed specimen)

Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2(CO3)(OH)2. The specimen appears to be a natural mixture or intergrowth of these two minerals.

Chert Pebble

Microcrystalline Quartz (SiO2)

Opalite

Man-made Glass (SiO2 + additives)

Jasper

Jasper (Silicon Dioxide, SiO2)

Ocean Jasper

Orbicular Jasper (Silicon Dioxide - SiO2)

Chert (specifically Flint or Common Chert node)

Silicon Dioxide (SiO2)

Magnetite

Magnetite (Fe3O4)