Multiple

Fire Agate

SiO2 (Silicon Dioxide with Iron Oxide inclusions)

Red jasper (likely iron-rich chalcedony/jasper)

Jasper, microcrystalline quartz (SiO₂), colored mainly by hematite/goethite

Raw greenish-blue quartz-bearing mineral specimen

Likely fluorite or chalcedony/quartz; exact identification requires hardness and crystal tests

Lapis Lazuli

Lapis Lazuli (Primary mineral: Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Quartzite River Cobble

Quartzite (SiO2)

Greywacke with Quartz Veins

Lithic Sandstone (Greywacke) with SiO2 inclusions

Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Hematite

Hematite (Fe2O3)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Hag Stone (Holey Rock / Fossiliferous Limestone)

Limestone (CaCO3) with natural erosion / fossil cavities

Herkimer Diamond in Matrix

Quartz (SiO2) in Dolostone (CaMg(CO3)2)

Lapis Lazuli (Lazurite crystals on Marble)

Lazurite / (Na,Ca)8[(S,Cl,SO4,OH)2|(AlSiO4)6]

Quartz Pebble

Silicon Dioxide (SiO2)

Yellow Quartzite River Cobble

Meta-quartzite (SiO2 with iron oxide staining)

Arid Sandy Loam

Arenosols / Regosols

Crinoid Stem Fossil (Indian Bead)

Crinoid ossicle (Echinodermata)

Agate Geode Node

Cryptocrystalline Quartz (SiO2)

Mixed river pebbles and quartz-rich specimens

Polymictic fluvial gravel; likely quartz, quartzite, chert, and weathered feldspathic rocks

Botryoidal Chalcedony

Cryptocrystalline Silicon Dioxide (SiO2)

Rhodonite, Gray Moonstone, and White Feldspar Mix

Multiple: MnSiO3 (Rhodonite), (K,Na)AlSi3O8 (Feldspar/Moonstone)

Mixed Tumbled Gemstones (Agate, Aventurine, Pyrite, etc.)

Multiple (principally Silicon Dioxide SiO2 and Iron Disulfide FeS2)

Carved Mottled Greenish-Yellow Crystal/Glass Object

Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.

Mother of Pearl (Nacre)

Calcium Carbonate (primarily aragonite, with conchiolin)

Crushed Stone / Gravel (Multiple Rock Types)

Lithic fragments (undifferentiated)

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Fluorite

Fluorite (Calcium Fluoride - CaF2)

Clear Quartz (or Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Botryoidal Hematite (Kidney Ore)

Hematite (Fe2O3)

Quartz (likely) or a Quartzite Pebble

Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.

Zircon

Zircon (ZrSiO4)

Botryoidal Chalcedony

Chalcedony (SiO2)

Mixed rock and mineral specimen collection

Multiple species, likely quartz (SiO₂), calcite (CaCO₃), feldspar, chert, and assorted volcanic/sedimentary rocks

Bi-Color Tourmaline (or Watermelon Tourmaline)

Tourmaline (complex borosilicate mineral group with general formula AD3G6(BO3)3T6O18(OH,O)4)

Mixed rock and mineral collection

Multiple specimens; visible pieces may include quartz, calcite, agate/chalcedony, jasper, and dyed or coated materials

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

Mixed rock and mineral collection

Multiple specimens; visible examples may include quartz (SiO₂), amethyst (quartz), calcite (CaCO₃), and dark mafic rocks

Ruby in Zoisite

Ruby (α-Al2O3) embedded in Zoisite (Ca2Al3(SiO4)3(OH)) with some Hornblende

Mystic Topaz (Treated Quartz or Topaz)

Silicate Mineral (SiO2 or Al2SiO4(F,OH)2) with Titanium coating

Mystic Topaz

Coated Al2SiO4(F,OH)2