Antropogenic (Man Made Industrial Byproduct)

Corundum

Corundum (Al2O3)

Scoria

Scoriaceous Basalt

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)

Granodiorite

Granodiorite

Sandstone Chert/Quartzite

Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite

Coquina

Bioclastic Limestone

Granite Gravel (Pebble)

Intrusive Felsic Igneous Rock

Nephrite Jade

Nephrite

Polished/tumbled brown-and-white mineral fragment

Indeterminate; possibly quartz-rich jasper, brecciated jasper, or an iron-stained quartz mineral

Exposed aggregate concrete (stone-chip surface)

Portland-cement concrete containing natural aggregate; not a natural rock

Quartz

Silicon Dioxide (SiO₂)

Fluorite (Fluor-spar)

Calcium Fluoride (CaF2)

Blue-green chrysocolla rough specimen

Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite

Fluorite (Purple/Blue variety)

Calcium Fluoride (CaF2)

Calligraphy Stone

Mariam Jasper (Fossiliferous Limestone composed of Hematite and Shell remains)

Silver (Native Element)

Ag (Argentum)

Chert / Flint

Chert (varieties include Flint)

Obsidian

Obsidian (volcanic glass)

Chalcedony (Common Opal/Chert variety)

Silicon Dioxide (SiO2)

Dark river-worn cobble, possibly basalt or fine-grained volcanic rock

Likely basaltic rock; exact identification requires a fresh surface and tests

Seraphinite

Clinochlore (Mg,Fe)5Al(AlSi3O10)(OH)8 - specific variety for Seraphinite due to its fibrous inclusions and chatoyancy.

Vanadinite

Lead Chlorovanadate, Pb5(VO4)3Cl

Peridot

Olivine (specifically, the gem-quality variety forsterite, (Mg,Fe)2SiO4)

Tumbled green aventurine (probable)

Quartzite dominated by quartz (SiO₂), with green mica/fuchsite or chlorite inclusions

Gold

Native Gold (Au)

Quartz (Float/Abraded)

Quartz (SiO₂)

Weathered fossiliferous limestone fragment, possibly fossil coral or shell material

Indeterminate carbonate fossil in calcitic limestone; likely composed mainly of calcite (CaCO₃), but species identification is not possible from this image alone

Vesicular Basalt (commonly mistaken for Slag)

Scoriaceous Basalt (composed primarily of Plagioclase Feldspar and Pyroxene)

Fossiliferous Limestone

Limestone (composed primarily of calcite with included fossils CaCO3)

Calcite

Calcium Carbonate (CaCO3)

Wollastonite

Calcium Inosilicate, CaSiO3

Note on Image Identification: Textile

N/A (Anthropogenic material)

Botryoidal Chalcedony

Chalcedony (SiO2)

Rounded gray river pebble, likely basalt or andesite

Fine-grained mafic volcanic rock; commonly basalt (plagioclase, pyroxene, and possible olivine)

Asphalt aggregate (crushed stone in bitumen)

Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen

Silver (Sterling Silver Jewelry)

Argentum (Ag) mixed with Copper (Cu)

Granite

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

Weathered iron-rich rock, likely basalt or ironstone

Probable weathered basalt (mafic silicate rock); exact identification requires a fresh surface and testing

Calcite

Calcite (CaCO3)

Concrete or asphalt-like aggregate surface with a dark fragment

Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock

Pearl (Biogenic Mineraloid)

Calcium carbonate (CaCO3) primarily as Aragonite

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.