Limonite (Iron Ore) rock specimen

Limonite (Iron Ore)

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

mineral

Chert rock specimen

Chert

Microcrystalline Quartz (SiO2)

sedimentary

Amber (Copal) rock specimen

Amber (Copal)

Succinite (fossilized tree resin)

mineral

Yellow Quartzite rock specimen

Yellow Quartzite

Silicon Dioxide (SiO2)

metamorphic

Quartzite rock specimen

Quartzite

Quartzite (SiO2)

metamorphic

Ferruginous Quartz rock specimen

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

mineral

Almandine Garnet rock specimen

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

mineral

Conglomerate rock specimen

Conglomerate

Conglomerate rock

sedimentary

Shale rock specimen

Shale

Fissile Siliciclastic Sedimentary Rock

sedimentary

Gold rock specimen

Gold

Native Gold (Au)

mineral

Chert (variations include Flint or Jasper) rock specimen

Chert (variations include Flint or Jasper)

Chert (Silicon Dioxide, SiO2)

sedimentary

Chert (Quartz Variety) rock specimen

Chert (Quartz Variety)

Chert (Silicon Dioxide, SiO2)

sedimentary

Green Fluorite rock specimen

Green Fluorite

Fluorite (Calcium Fluoride - CaF2)

mineral

Graphic Granite rock specimen

Graphic Granite

Graphic Granite (Granitic Pegmatite), typically KAlSi3O8 (Feldspar) + SiO2 (Quartz)

igneous

Serpentine rock specimen

Serpentine

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

metamorphic

Granite River Pebble rock specimen

Granite River Pebble

Phaneritic Granite (primarily Quartz, Feldspar, and Mica)

igneous

Basalt (Weathered/River worn) rock specimen

Basalt (Weathered/River worn)

Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)

igneous

Basalt with Epidote/Chlorite rock specimen

Basalt with Epidote/Chlorite

Amygdaloidal Basalt (SiO2 with (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)))

igneous

Pumice (specifically a water-worn, weathered variety) rock specimen

Pumice (specifically a water-worn, weathered variety)

Vesicular volcanic glass

igneous

Quartzite rock specimen

Quartzite

Quartzite (primarily SiO2)

metamorphic

Nephrite Jade (River Cobble) rock specimen

Nephrite Jade (River Cobble)

Nephrite (Silicate mineral: Ca2(Mg, Fe)5Si8O22(OH)2)

metamorphic

Diamond (as featured in jewelry) rock specimen

Diamond (as featured in jewelry)

Diamond (C - pure carbon)

mineral

Porphyry rock specimen

Porphyry

Porphyritic Andesite/Basalt

igneous

Diamond (or Diamond Simulant like Cubic Zirconia) rock specimen

Diamond (or Diamond Simulant like Cubic Zirconia)

Carbon (C) - if Diamond; Zirconium dioxide (ZrO2) - if Cubic Zirconia

mineral

Yellow Sapphire or Citrine rock specimen

Yellow Sapphire or Citrine

Al2O3 (Corundum) or SiO2 (Quartz)

mineral

Cubic Zirconia rock specimen

Cubic Zirconia

Zirconium dioxide (ZrO2)

mineral

Peridot rock specimen

Peridot

Olivine (Mg, Fe)2SiO4

Mineral

Sapphire rock specimen

Sapphire

Corundum (Al2O3)

mineral

Diamond (or Diamond Simulant/Cubic Zirconia) rock specimen

Diamond (or Diamond Simulant/Cubic Zirconia)

Carbon (C) - if diamond, or Zirconium dioxide (ZrO2) - if Cubic Zirconia

mineral

Turquoise rock specimen

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

mineral

Peridot rock specimen

Peridot

Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4

mineral

White Topaz rock specimen

White Topaz

Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)

mineral

Apache Tear rock specimen

Apache Tear

Hydrated Obsidian (Natural Volcanic Glass)

igneous

Diamond rock specimen

Diamond

Carbon (C)

mineral

Red Jasper rock specimen

Red Jasper

Silicon Dioxide (SiO2) with Iron inclusions

sedimentary

Diamond (or Cubic Zirconia simulant) rock specimen

Diamond (or Cubic Zirconia simulant)

Carbon (C) or Zirconium Dioxide (ZrO2)

mineral

Turquoise rock specimen

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

mineral

Citrine rock specimen

Citrine

Citrine (Silicon Dioxide - SiO2)

mineral

Amethyst rock specimen

Amethyst

Silicon Dioxide (SiO2) with iron impurities

mineral

Ruby rock specimen

Ruby

Corundum (Al2O3 with Chromium traces)

mineral

Blue Zircon rock specimen

Blue Zircon

Zirconium Silicate (ZrSiO4)

mineral

Amethyst (Faceted) rock specimen

Amethyst (Faceted)

Silicon Dioxide with Iron impurities (SiO2)

mineral