Metamorphic Or Sedimentary Depending On Local Grade

Quartz Geode (Cracked Open Fragment)

Silicon Dioxide (SiO2)

Sandstone or Quartzite

Arenite (if sedimentary) / Quartzite (if metamorphic)

Ruby

Corundum (Al2O3 with Chromium traces)

Gneiss

Gneiss (High-grade metamorphic rock)

Rough Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Anthracite

Anthracite coal

Garnet in Matrix

Almandine or Spessartine Garnet in Quartz/Schist Matrix (X3Al2(SiO4)3)

Sandstone (with cross-bedding)

Arenite (composed primarily of Quartz: SiO2)

Quartzite River Cobble

Quartzite (SiO2)

Jade (likely Nephrite Jade based on appearance)

Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)

Kyanite in Quartz

Kyanite (Al2SiO5) with Quartz (SiO2)

Amphibolite

Amphibolite (rich in amphibole and plagioclase feldspar)

Ruby (Corundum)

Aluminum oxide (Al2O3) with Chromium traces

Biotite Schist

Biotite Schist

Blue Chalcedony

Cryptocrystalline Quartz (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Charoite

(K,Sr,Ba,Na)15-16(Ca,Na)32[Si6O11(O,OH)2]2[Si12O18(O,OH)6]2[Si17O25(O,OH)18]2(OH,F)4 · nH2O

Gneiss

Gneiss (High-grade metamorphic rock)

Pebble (river rock/beach pebble)

Pebble (clast size class)

Granite / Gneiss Complex

Felsic Plutonic Rock (Granite) or High-grade Metamorphic Rock (Gneiss)

Blue Kyanite

Kyanite (Al2SiO5)

Milky Quartz

Silicon Dioxide (SiO2)

Green Tourmaline

Elbaite (Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)4)

Chrome Diopside

Magnesium Calcium Silicate (MgCaSi2O6) containing Chromium impurities

Garnet in Schist (Polished Tower)

Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist

Crushed Limestone and Calcite

Calcium Carbonate (CaCO3)

Chert (Jasper/Opaline variety)

Silicon Dioxide (SiO2)

Gneiss (Granitic Gneiss)

Gneiss

Coal (Anthracite)

Anthracite (Carbon-based organic sedimentary/metamorphic rock)

Jasper

Silicon dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Garnet

Garnet group: X3Y2(SiO4)3 (commonly Almandine-Pyrope series)

Lapis Lazuli

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

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Dragon Blood Jasper

Epidote-containing Quartz and Chlorite (SiO2 + (Ca2(Al, Fe)3(SiO4)3(OH)))

Ironstone Concretion

Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)

Agate (Chalcedony)

Cryptocrystalline Silica or Silicon Dioxide (SiO2)

Ruby

Corundum (Al2O3:Cr)

Garnet Schist

Almandine Garnet in Mica Schist

Banded Slate

Slate (Metamorphosed Siltstone/Mudstone)

Foliated Metamorphic Rock (likely Gneiss or Schist)

Gneissic Metamorphic Rock