Anthropogenic (Man Made Industrial Deposit)

Note: Item is not a geological specimen

Polyester mesh and Ethylene-vinyl acetate (EVA) polymer

Black tourmaline (schorl)

Schorl, a sodium–iron borosilicate: NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Rounded brown river pebble

Indeterminate lithic fragment; possibly weathered sandstone, mudstone, or basalt

Possible weathered metallic mineral specimen

Uncertain; possibly native copper-bearing rock or iron sulfide in a gray host matrix

Basalt

Basalt

Fossil brachiopod or bivalve shell

Indeterminate fossilized carbonate shell; likely a brachiopod (Phylum Brachiopoda)

Fossil Shark Tooth

Lamniform (Mackerel Shark) fossil tooth, likely Otodus or Cretalamna

Grey Chalcedony

Silicon Dioxide (SiO2)

Ruby (mounted cabochon)

Corundum, Al₂O₃; red color typically from chromium

Rough green beryl (possibly emerald)

Beryl, Be₃Al₂Si₆O₁₈; emerald is chromium- or vanadium-colored green beryl

Tumbled greenstone (likely serpentinite or green jasper)

Serpentinite, commonly dominated by serpentine-group minerals (Mg₃Si₂O₅(OH)₄); exact identification requires testing

Botryoidal chalcedony with quartz vug

Microcrystalline quartz, SiO₂ (chalcedony), with a drusy quartz-lined cavity

Rounded fine-grained dark pebble

Likely basalt or basaltic volcanic rock; exact identification requires testing

Diamond ring

Diamond, crystalline carbon (C)

Silver (Native Silver)

Native Silver (Ag)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Sphalerite with quartz

Sphalerite (ZnS), associated with quartz (SiO₂)

Small metallic-looking mineral/rock fragment

Indeterminate from image; possibly galena, hematite, or metallic slag

Likely labradorite-bearing pebble; the label also says “carnelian,” but that identification is uncertain

Labradorite, a plagioclase feldspar: approximately (Ca,Na)(Al,Si)₄O₈

Polished hematite (specimen identification uncertain)

Hematite, α-Fe₂O₃

Fluorite on matrix

Fluorite (CaF₂), likely on a pale quartz or calcite matrix

Quartz-veined river pebble

Quartz-bearing metamorphic rock, possibly silicified schist or altered volcanic rock

Quartzite

Quartzite (SiO2)

Banded quartz-rich pebble, possibly jasper or agate

Microcrystalline quartz (SiO₂), likely chalcedony/jasper with iron-oxide staining

Amethyst crystal fragment

Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron and irradiation

Diamond (in jewelry setting)

Carbon (C)

Dalmatian jasper (polished stone beads)

Commercial “Dalmatian jasper”; typically a feldspar-rich rock with dark aegirine or arfvedsonite inclusions, not true jasper

Diamond

Carbon (C)

Iron Slag

Ferrous Slag (Industrial Byproduct)

White Marble

Recrystallized Calcite (CaCO3)

Tourmalinated quartz point

Quartz (SiO₂) with black tourmaline (schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) inclusions

Polished purple quartz gemstone, likely amethyst

Amethyst; crystalline silicon dioxide (SiO₂) colored mainly by iron-related defects

Magnetite / Lodestone

Magnetite (Fe3O4)

Amethyst

SiO2 (Silicon Dioxide with iron impurities)

Rose Quartz

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

Quartz-rich pegmatite, likely with iron staining

Granitic pegmatite, chiefly quartz (SiO₂) and feldspar, with possible mica and iron oxides

Likely galena-bearing ore

Galena (lead sulfide, PbS), possibly mixed with quartz or other sulfides

Banded Calcite or Travertine

Calcium Carbonate (CaCO3)

Botryoidal quartz (likely chalcedony/agate)

Microcrystalline silica, SiO₂; possibly quartz-rich chalcedony with iron-oxide staining

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Tumbled purpurite (probable)

Purpurite, (Mn,Fe)PO₄; visual identification is uncertain from the photo

Brown weathered river pebble

Indeterminate lithology; likely ferruginous sandstone, mudstone, or weathered volcanic rock