Not A Geological Specimen

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Green Moss Agate

Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite

Granite

Phaneritic Plutonic Felsic Rock (primarily Quartz (SiO2), Alkali Feldspar, and Plagioclase Feldspar)

Yellow Quartzite (River Pebble)

Metamorphic Quartzite (SiO2)

Chert (specifically Tan/Brown Chert)

Chert (SiO2)

Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Almandine Garnet

Almandine - Fe3Al2(SiO4)3

Quartz (Crystalline Cluster)

Silicon Dioxide (SiO2)

Chert (and Jasper variety)

Microcrystalline Quartz (SiO2)

Sodalite

Na8(Al6Si6O24)Cl2 (Sodalite)

Rose Quartz

Silicon Dioxide (SiO2) with traces of titanium, iron, or manganese

Lapis Lazuli (prominent blue specimen in collection)

Lazurite-rich metamorphic rock (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2

Rainbow Fluorite

Fluorite (Calcium Fluoride, CaF2)

Moss Agate

Silicon dioxide (SiO2) with inclusions

Jasper with Quartz Veining

Silicon Dioxide (SiO2) - Cryptocrystalline Chalcedony

Epidote and Quartz in Basalt

Epidote [Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)] in Metabasalt

Pyrite

Iron Disulfide (FeS2)

Amazonite

K(AlSi3O8) - Microcline variant

Smoky Quartz with Siderite and Pyrite

Silicon Dioxide (SiO2) with Ferrous Carbonate (FeCO3) and Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Basalt with Quartz Veins

Basalt (complex silicate) with Quartz (SiO2) intrusions

Basalt

Basalt (Aphanitic Mafic Volcanic)

Amazonite

Potassium Feldspar (KAlSi3O8), specifically Microcline

Yellow Quartzite (Golden Quartz)

Quartzite (primarily SiO2)

Chrysocolla on Quartz/Rhyolite matrix

Hydrated copper phyllosilicate mineral: (Cu,Al)2H2Si2O5(OH)4·nH2O

Quartz with Mica/Chlorite inclusions

Silicon Dioxide (SiO2) with phyllosilicate inclusions

Orange Calcite

Calcium Carbonate (CaCO3)

Quartz (likely Rose Quartz or Milky Quartz based on color)

Quartz (SiO2 - Silicon Dioxide)

Red Sandstone (Siltstone/Mudstone variety)

Ferruginous Sandstone (composed primarily of Quartz with Hematite cementation)

Limonite/Goethite Nodule

Iron Oxyhydroxide (primarily FeO(OH)·nH2O)

Quartz crystal with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Granite Pegmatite

Coarse-grained Granite (SiO2 - Aluminum and Alkalies)

Pyrite

Iron Sulfide (FeS2)

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Obsidian

Obsidian (Volcanic Glass, SiO2 + impurity)

Biotite (Black Mica)

Biotite [K(Mg,Fe)3(AlSi3O10)(F,OH)2]

Granite (with alteration)

Granite (Felsic intrusive igneous rock)

Porphyritic Rhyolite or Andesite (Porphyry)

Porphyritic igneous rock (Composition depends on exact mineralogy, often Rhyolite or Andesite)

Basalt (Purple-tinted scoria/vesicular variety)

Extrusive mafic igneous rock (SiO2 range 45–52%)

Jasper

Jasper (Silicon Dioxide, SiO2 plus various impurities)