Metamorphic Or Sedimentary Depending On Local Grade

Ruby (Raw Corundum)

Corundum (Al2O3) with Chromium traces

Sapphire (Corundum)

Corundum (Al2O3), variety Sapphire

Slate

Foliated Metamorphic Rock (primarily composed of quartz, illite, and chlorite)

Greenstone

Chlorite schist / Meta-basalt

Pegmatite (likely Granitic Pegmatite)

Pegmatite (a coarse-grained igneous rock, often with granitic composition)

Gold in Quartz Ore

Hydrothermal Quartz with native Gold (Au)

Greenstone / Greenschist

Chlorite schist / Epidiorite

Anthracite Coal

Anthracite (Carbon-based organic sedimentary rock exposed to metamorphic heat/pressure; Chemical composition is approximately 86%–98% Carbon)

Green Tourmaline

Verdelite (Silicate mineral); Na(Li,Al)3Al6(BO3)3Si6O18(OH)4

Bull Quartz (White Quartz)

Silicon Dioxide (SiO2)

Gold Ore in Quartz

Native Gold (Au) in Quartz (SiO2) matrix

Marble

Metamorphosed Limestone/Dolomite

Chert (or potentially massive Quartz/Quartzite)

SiO2 (Silicon Dioxide)

Yellow Apatite Sphere (Polished)

Fluorapatite / Ca5(PO4)3F

Green Aventurine

SiO2 (Silicon Dioxide with Fuchsite inclusions)

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (SiO2)

Iron-Stained Quartzite

Quartzite (chemically SiO2 with Fe2O3/FeO(OH) staining)

Diamond (Macled/Crystal fragment)

Carbon (C), isometric crystal system

Yellow Quartzite

Quartzite (primarily SiO2)

Quartz with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate [Ca2(Al,Fe)3(SiO4)3(OH)]

White Quartz Cobble

Quartz (Silicon Dioxide, SiO2)

Agate Geode

Silicon Dioxide (SiO2) - Variety Agate with Quartz crystal center

Prehnite

Prehnite, Ca2Al(AlSi3O10)(OH)2

Plagioclase Feldspar

Plagioclase Feldspar Series (NaAlSi3O8 - CaAl2Si2O8)

Sandstone

Sandstone (clastic sedimentary rock)

Schist

Mica Schist

Epidote in Matrix (likely Amphibolite or Gneiss)

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)) in Metamorphic Matrix

Greenstone / Epidosite

Metamorphosed Mafic Igneous Rock (Epidote-Chlorite group)

Greenstone (Altered Mafic Rock)

Greenschist / Meta-basalt

Greenstone (Epidosite or Altered Basalt)

Epidosite (Ca2(Al, Fe)3(SiO4)3(OH))

Greenstone (Greenstone River Pebble)

Greenschist (metamorphosed mafic igneous rock)

Greenstone (Diabase or Metabasalt)

Metamorphosed Mafic Igneous Rock

Greenstone

Metabasalt

Mica Schist

Mica Schist (predominantly Muscovite/Biotite)

Greenstone

Metabasalt (Greenstone Facies)

Quartzite

Metamorphosed Sandstone (Mainly SiO2)

Green Aventurine

Aventurine Quartz (SiO2)

Lapis Lazuli (Low Grade)

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

Nuummite

Nuummite (Orthoamphibole rock composed of Anthophyllite and Gedrite, (Mg,Fe)7Si8O22(OH)2)

Iron Ore / Ironstone Concretion

Mixture of iron oxide/hydroxide minerals, likely some combination of Hematite (Fe2O3), Goethite (α-FeOOH), and Limonite (a general term for hydrated iron oxides of variable composition) or potentially Bauxite (a mixture of aluminum hydroxides, often with iron oxides, (Al(OH)3) and FeO(OH)). The visual characteristics strongly suggest iron-rich material.

General river rock or weathered cobble

Mixed rock composition