Anthropogenic (Man Made Product Subject To Geological Processes)

Slag (Industrial Glass/Metal)

Ferrous slag or Glassy silicate byproduct

Pink Coral

Corallium rubrum (Calcium Carbonate, CaCO3)

Tumbled dark green stone, likely serpentine or nephrite jade

Serpentine-group minerals, chiefly antigorite/lizardite; possibly nephrite, an aggregate of tremolite–actinolite

Dark foliated metamorphic rock, probably schist

Mica schist, likely quartz–muscovite/biotite schist

Likely foliated metamorphic rock (schist or gneiss fragment)

Mica schist–gneiss; chiefly quartz, feldspar, and mica

Mixed stone-bead bracelet, likely agate/jasper and possibly sodalite or dyed quartz

Primarily microcrystalline quartz (SiO₂) varieties, with opaque iron-rich chalcedony/jasper and probable blue sodalite or dyed material

Fossilized echinoid (sea urchin), likely a sand dollar fragment or small regular urchin

Echinodermata; commonly Clypeasteroida or Echinoida, preserved mainly as calcite (CaCO₃)

Calcite

Calcite (Mineral, Calcium Carbonate - CaCO3)

Quartzite

Quartzite, composed predominantly of recrystallized quartz (SiO₂)

Likely biotite-bearing metamorphic rock (schist or gneiss)

Mica schist/gneiss; chiefly quartz, feldspar, and biotite mica

Rounded gray metamorphic pebble, likely gneiss or mica schist

Quartz–feldspar–mica metamorphic rock; exact identification requires a close examination or thin section

Small amber-colored mineral fragment (identity uncertain)

Undetermined; appearance alone is insufficient for a reliable mineral identification

Mica-rich pegmatite (likely muscovite-bearing)

Granitic pegmatite composed mainly of quartz, feldspar, and mica; mica is likely muscovite, KAl₂(AlSi₃O₁₀)(OH)₂

Red Jasper

Jasper (Silicon Dioxide with iron oxide inclusions), SiO2

Tumbled ruby in matrix

Corundum (Al₂O₃), commonly with mica, calcite, or other matrix minerals

Blue-green gemstone ring, likely treated turquoise or synthetic/treated beryl

Indeterminate from image; possibilities include turquoise (CuAl6(PO4)4(OH)8·4H2O), apatite, or treated beryl

Quartz

Quartz (Silicon Dioxide - SiO2)

Foliated metamorphic rock, likely mica schist

Mica schist, mainly quartz–feldspar–mica assemblage

Likely schist or foliated metamorphic rock

Mica schist, possibly amphibole-bearing; composition likely quartz, feldspar, biotite and/or hornblende

Muscovite Schist

KAl2(AlSi3O10)(OH)2 (Muscovite) in Schist Matrix

Weathered schist or phyllite

Mica-rich pelitic metamorphic rock; commonly quartz–muscovite/biotite schist or phyllite

Mica-rich metamorphic rock, likely schist

Quartz–mica schist; commonly quartz with muscovite and/or biotite mica

Quartzite

Quartzite (primarily SiO2)

Blue calcite (probable)

Calcite, CaCO₃

Tumbled brecciated jasper

Jasper (microcrystalline quartz, SiO₂), brecciated variety

Likely foliated metamorphic rock (quartz-mica schist or gneiss)

Quartz–feldspar–mica metamorphic rock; exact identification requires a fresh surface and tests

Mixed mineral and rock specimen collection

Assorted silicates, carbonates, oxides, and sulfides; individual species cannot be reliably identified from this image

Road-surface aggregate (crushed stone)

Unidentifiable mixed lithic aggregate; likely basaltic/andesitic fragments with feldspar, quartz, and weathered rock

Quartzite

Metamorphic Quartz Rock (SiO2)

Chert with Asphaltum (or Tar)

Silica (SiO2) with natural Bitumen/Asphaltum

Tumbled cat’s-eye stone, likely cat’s-eye glass or imitation

Undetermined; natural chrysoberyl cat’s-eye is BeAl₂O₄, but the photo does not establish that identity

Weathered serpentinized ultramafic rock

Serpentinite; chiefly serpentine-group minerals, commonly with magnetite, brucite, talc, and relict olivine/pyroxene

Red jasper (likely brecciated jasper)

Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides

Tumbled carnelian

Carnelian, a reddish-orange variety of chalcedony (microcrystalline quartz, SiO₂)

Pearls

Nacre, composed mainly of aragonite (CaCO₃) and conchiolin

Unidentified Rock Fragment

Unknown

Tumbled jasper (likely brecciated or leopard jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions

Amethyst

Amethyst (Silicon Dioxide, SiO2 + Fe)

Quartz pebble in concrete

Quartz (SiO₂), embedded in Portland-cement concrete

Sandstone

Arenite (SiO2 based with various mineral cements)

Tumbled jasper or brecciated jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and dark mineral inclusions

Polished brecciated jasper

Silica-rich microcrystalline quartz (SiO₂), likely brecciated jasper with iron-oxide staining