Sedimentary Or Metamorphic Derived

Quartzite with Hematite staining

Quartzite (SiO2) with iron oxide inclusions (Fe2O3)

Likely weathered quartz or feldspar grain

Uncertain; possibly quartz (SiO₂) or a feldspar mineral

Red Jasper (Polished)

Jasper (Iron-rich Microcrystalline Quartz, SiO2)

Schist

Mica Schist

Unakite

Altered Granite (Epidote-bearing Granitic Rock)

Rhodonite

Rhodonite (Manganese Iron Magnesium Calcium Silicate) - (Mn,Fe,Mg,Ca)SiO3

Epidote Water-Worn Pebble

Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Polished greenstone pebble (likely serpentine or chlorite-rich stone)

Serpentine-group minerals, commonly antigorite/lizardite; possible chlorite-rich metamorphic rock

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Red Jasper

Silicon Dioxide (SiO2) with hematite inclusions

Red Jasper

Silicon Dioxide (SiO2) with iron oxide (Fe2O3) inclusions

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Red Jasper (nodule)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Raw selenite (gypsum)

Gypsum, CaSO₄·2H₂O; translucent variety selenite

Anyolite

Ruby in Zoisite (Zoisite with Corundum)

Mica-rich schist (likely biotite schist)

Biotite–quartz–feldspar schist; mica is chiefly biotite, K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂

Banded River Cobble with Mafic Dike

Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion

Limonite (Iron Ore)

Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)

Agate (Chalcedony)

Silicon Dioxide (SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Jasper

Silicon dioxide (SiO2) with impurities

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Jasper

Silicon dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Jasper or Agate with Chlorite Inclusions

Silicon Dioxide (SiO2) with Chlorite group minerals

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Carnelian

Carnelian (SiO2, Silicon Dioxide with Iron Oxide impurities)

Tumbled orange chalcedony and a gray stone disk

Chalcedony (microcrystalline quartz, SiO₂); disk likely fine-grained sandstone or slate

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Ruby Zoisite

Anyolite (Composition of Green Zoisite, Black Tschermakite, and Red Corundum)

Mixed rock and mineral collection

Mixed lithologies; likely quartz, feldspar, basalt, granite, chert, sandstone, and metamorphic rocks

Serpentinized ultramafic rock (serpentinite)

Serpentinite, dominated by serpentine-group minerals (lizardite/chrysotile/antigorite), with possible magnetite, talc, and brucite

Rounded dark river pebble, possibly serpentinite

Serpentinite (serpentine-group minerals; commonly lizardite/chrysotile/antigorite), identification tentative

Likely serpentinite or serpentinized ultramafic rock

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and relict olivine/pyroxene

Serpentinized ultramafic rock (likely serpentinite)

Serpentinite; chiefly serpentine-group minerals (chrysotile, lizardite, antigorite), with olivine/pyroxene relics and possible magnetite

Serpentinized ultramafic rock (likely serpentinite)

Serpentinite; chiefly serpentine-group minerals, with possible magnetite, olivine, pyroxene, and talc

Botryoidal Chalcedony (Geode fragment)

Silicon Dioxide (SiO2)

Jasper Conglomerate (Puddingstone)

Siliceous Conglomerate (Quartz and Jasper clasts in a fine-grained matrix)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)