Organic (Paper And Cellulose)

Banded Agate

Cryptocrystalline Quartz (SiO2)

Polished black stone, possibly black marble or basalt

Probable fine-grained mafic rock; exact identification requires testing

Polished basalt sphere

Basalt; predominantly plagioclase feldspar, pyroxene, and commonly olivine

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Petrified wood

Silicified wood, commonly quartz/chalcedony (SiO₂) replacing woody tissue

Dyed and polished agate heart

Microcrystalline quartz (chalcedony), SiO₂; likely druzy quartz inclusions

Polished black agate geode slice

Microcrystalline quartz (chalcedony), SiO₂, with possible iron-oxide matrix and druzy quartz

Polished banded stone, likely black marble or banded gneiss

Graphitic banded marble or quartz-feldspar biotite gneiss; exact identification requires testing

Tumbled amber-colored agate or jasper

Microcrystalline quartz (SiO₂), likely chalcedony with iron-oxide inclusions

Tumbled white quartzite or milky quartz

Quartzite; predominantly microcrystalline quartz (SiO₂), though a quartz pebble is also possible

Tumbled greenstone / altered basalt pebble

Fine-grained mafic volcanic rock, likely basalt or greenstone; commonly composed of plagioclase, pyroxene, chlorite, epidote, and iron oxides

Polished brown pebble, likely jasper or iron-stained quartzite

Uncertain; possible microcrystalline quartz (SiO₂) with iron-oxide staining

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Granite (with Quartz Vein and Biotite)

Granite (Plutonic Igneous Rock)

Kaolinite Claystone

Al2Si2O5(OH)4 (Kaolinite)

Tumbled brown-and-white feldspar-rich stone, likely granite or quartzite

Indeterminate; probably quartz–feldspar aggregate (granite) or quartzite, with iron-oxide staining

Rounded quartz-rich sandstone pebble

Quartz arenite or feldspathic sandstone; primarily SiO₂ quartz grains with minor feldspar, iron oxides, and clay minerals

Polished mixed rock, likely orbicular/epidote-bearing granite or basalt

Uncertain; probable quartz–feldspar–amphibole/epidote aggregate

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Limestone or Chalk

Calcium Carbonate (CaCO3)

Polished fossil coral

Fossilized colonial coral, commonly tabulate or rugose coral; calcite (CaCO₃) replacement

Tumbled orbicular granite (likely orbicular diorite)

Orbicular granitoid; chiefly quartz, feldspar, and dark amphibole/biotite minerals

Agate Geode / Thunderegg

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(F,OH)2

Anthracite coal

Anthracite; predominantly carbon (C), with minor mineral ash

Banded Sandstone

Arenite (with iron oxide banding)

Polished malachite

Malachite, Cu₂CO₃(OH)₂

Rounded dark river pebble

Likely basalt or fine-grained andesite; exact identification requires testing

Marble

Recrystallized Calcite (CaCO3)

Banded Iron Formation (BIF) / Red Jasper with Hematite

Ferruginous Chert (primarily Quartz [SiO2] and Hematite [Fe2O3])

Carrara Marble

Metamorphosed Limestone (principally Calcium Carbonate, CaCO3)

Porphyritic Basalt

Basalt with plagioclase phenocrysts

Blue agate slice with quartz crystal cavity

Chalcedony (microcrystalline SiO₂) with quartz (SiO₂)

Pyrite

Iron Disulfide (FeS2)

Calcite

Calcium Carbonate (CaCO3)

Pyrite

Iron Sulfide (FeS2)

Polished/tumbled stones, likely quartz varieties

Likely quartz (SiO₂), with the left specimen possibly rose quartz or orange calcite; exact identification is uncertain from the image

Gowganda Tillite (Puddingstone)

Glacial Tillite (Diamictite) with Jasper inclusions

Pyrite

Iron Sulfide (FeS2)

Polished fossiliferous agate

Chalcedony (microcrystalline SiO₂) containing fossil fragments, likely an agatized limestone or stromatolite

Banded Gneiss

Gneiss (Metamorphic high-grade, predominantly SiO2, Al2O3, K2O, Na2O)

Tumbled blue-gray stone, likely quartzite or chalcedony

Quartz-rich rock; predominantly microcrystalline or granular SiO₂, identification uncertain from image