Organic Materia (Not A Rock Or Mineral)

Granite Pebble

Intrusive Igneous Rock

Tumbled Mineral Collection (Amethyst, Celestite, K2 Jasper, Rose Quartz, Ruby in Zoisite, Que Sera Stone)

Mixed Mineral Specimens (Quartz SiO2, Celestite SrSO4, Corundum Al2O3 with Zoisite, etc.)

Granite

Intrusive Igneous Rock

Sandstone

Arenite (SiO2 principal composition)

Sandstone

Arenite (SiO2 primarily)

K-Feldspar (Potassium Feldspar)

Orthoclase / Microcline (KAlSi3O8)

Copper Ore Specimen

Cupriferous Rock / Malachite-bearing ore

Granite

Intrusive igneous rock

Agate / Chalcedony Geode

Silicon Dioxide (SiO2)

Feldspar-Quartz Rock (likely Pegmatite or Granite)

Feldspar-Quartz composite rock (KAlSi3O8 - SiO2)

Sandstone

Sandstone (Quartz-rich sedimentary rock)

Fossilized Horn Coral

Rugosa (Tetracoralla)

Petrified Wood

Silicified Wood (SiO2)

Botryoidal Chalcedony (Desert Rose / Agate)

Silicon Dioxide (SiO₂)

Amber

Succinite (C10H16O)

Sandstone Pebble

Sedimentary quartz arenite

Gneiss

Gneiss (foliated metamorphic rock)

Chert / Flint

Chert (varietal name for microcrystalline quartz). Chemical formula: SiO₂

Gneiss

Gneiss

Quartz Veined Mudstone

Metasedimentary rock with Quartz (SiO2) veins

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Possible tektite or iron-rich slag-like natural specimen

Uncertain; possibly natural glass (tektite) or magnetite-rich rock

Gneiss

Banded orthogneiss or paragneiss, typically quartz–feldspar–mica bearing

Sandstone and Mixed Rock Assemblage

Clastic Sedimentary Rock / Quartz Arenite

Mixed rock and mineral collection

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

Mixed Mineral and Rock Collection

Mixed geological specimens (Quartz, Amethyst, Rose Quartz, Jasper, Epidote, Chert)

Quartz Pebble

Silicon Dioxide (SiO2)

Slate

Foliated Metamorphic Rock

Quartz Pebble (Iron-Stained)

Silicon Dioxide (SiO2)

Quartz fragment (Pebble)

Silicon Dioxide (SiO2)

Dalmatian Jasper

Dalmatian Stone (a microcrystalline quartz and feldspar rock with arfvedsonite)

Tiger's Eye (Brown/Dark variety)

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

Granite

Intrusive igneous rock

Sandstone with Quartz Vein

Arenite with Quartz (SiO2) protrusion

Gold-bearing Quartz with Iron Oxides

Quartz (SiO2) with Limonite/Goethite (FeO(OH)) and Pyrite (FeS2)

Sandstone with Manganese Staining

Quartz Arenite / Sedimentary Rock

Yellow Ochre / Limonite

Limonite (FeO(OH)·nH2O)

Mixed rock and mineral collection

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

Mixed rock and mineral specimen collection

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

Mineral and Rock Collection (Assorted)

Mixed collection including Quartz (SiO2), Jasper (SiO2 with impurities), Rose Quartz, and Aventurine

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Tiger's Eye (Mineral Collection)

Tiger's Eye (SiO2 with crocidolite inclusions)