Synthetic (Ceramic)

Lepidolite in Quartz Matrix

Lepidolite (K(Li,Al)3(Al,Si)4O10(F,OH)2) in Quartz (SiO2) matrix

Lepidolite

K(Li,Al)3(Al,Si,3O10)(F,OH)2

Quartzite Pebble

Quartzite (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Banded agate (likely Montana/Columbia River-style agate)

Microcrystalline quartz, SiO₂ (chalcedony with mogánite; iron-oxide staining)

Probable magnetite-bearing rock

Magnetite (Fe₃O₄), possibly in a fine-grained host rock

Gemstone Ring

Various (Likely Glass, Cubic Zirconia, or assorted semi-precious stones)

Small colored gemstone or glass cabochons (uncertain)

Not identifiable from the image; the pieces may be colored glass or synthetic stones rather than natural minerals.

Red cabochon gemstone ring (likely ruby or red spinel; identity unconfirmed)

Possibly corundum (ruby, Al₂O₃) or spinel (MgAl₂O₄); visual identification alone cannot distinguish these from glass or synthetic stones.

Tumbled magnetite (likely)

Magnetite, Fe₃O₄

Iron-rich concretion or weathered ironstone

Limonite/goethite-rich ironstone; commonly hydrated iron oxides, chiefly FeO(OH)·nH₂O

Tumbled pink quartz (likely rose quartz)

Rose quartz, quartz (SiO₂), commonly colored by trace elements and microscopic inclusions

Goethite / Limonite Concretion

Iron Hydroxide Oxide (FeO(OH))

Pink potassium feldspar (orthoclase/microcline)

KAlSi₃O₈; likely massive potassium feldspar, possibly with quartz

Pink feldspar fragment

Likely potassium feldspar (orthoclase or microcline), KAlSi₃O₈

Silty Sand / Loam

Unconsolidated Clastic Sediment (Silicon Dioxide / Alumino-silicates mixture)

Milky Quartz

Silicon Dioxide (SiO2)

Ruby (Raw Corundum)

Al2O3 (Aluminum Oxide)

Pyrite (fool’s gold)

Iron disulfide, FeS₂; commonly a massive or granular sulfide specimen

Likely quartz-rich rock fragment

Quartz (SiO₂), possibly in a feldspar-bearing granite or pegmatite matrix

Cubic Zirconia and Synthetic Ruby Jewelry

Cubic Zirconia (ZrO2) and Synthetic Corundum (Al2O3)

Polished magnetite-rich ironstone (possible magnetite pebble)

Magnetite, Fe₃O₄; possibly magnetite-bearing basalt or ironstone

Weathered iron-rich rock, possibly laterite or limonite-bearing quartzite

Limonite/goethite mixture, commonly FeO(OH)·nH₂O, with possible quartz and iron oxides

Iron-rich jasper / hematite-bearing breccia

Ferruginous jasper, chiefly microcrystalline SiO₂ with hematite/goethite (Fe₂O₃/FeO(OH)) and possible limonite

Limonite/Hematite Ironstone

Goethite-rich Ironstone (FeO(OH) · nH2O)

Pyrite-bearing Schist

Pyritic Quartz-Mica Schist with FeS2 inclusion

Sapphire

Corundum (Al2O3)

Opalite

Man-made glass (traditionally simulated Opal)

Specular Hematite with Pyrite

Iron Oxide (Fe2O3) with Iron Sulfide (FeS2)

Silicon Carbide (Carborundum)

Silicon Carbide, SiC

Amber (and Cubic Zirconia)

Fossilized Tree Resin

Red glassy mineral specimen, likely synthetic ruby or red spinel

Most consistent with synthetic corundum (Al₂O₃, ruby) or synthetic spinel (MgAl₂O₄); exact identification requires testing

Opalite

Synthetic glass / Opaque silicious glass

Blue Goldstone

Man-made glass with crystalline copper/cobalt inclusions

Note on Image Identification: Textile

N/A (Anthropogenic material)

Likely iron-rich rock or meteorite fragment

Indeterminate; possible hematite-/magnetite-bearing material

Fossiliferous limestone fragment

Bioclastic limestone, primarily calcite (CaCO₃)

Weathered iron-rich concretion or ironstone pebble

Goethite/hematite-bearing limonite concretion (approximate identification)

Silver-gray metallic ore, possibly galena-bearing rock

Likely galena (PbS) in a host rock, but identification is uncertain from the photograph

Indeterminate metallic mineral fragments

Possibly pyrite, chalcopyrite, or metallic sulfide-bearing rock

Possible iron-rich stone or meteorite fragment

Undetermined; possibly magnetite-bearing rock or an ordinary chondrite