Metamorphic Or Sedimentary

Almandine Garnet

Iron aluminum silicate (Fe3Al2(SiO4)3)

Garnet

Almandine formula: Fe3Al2(SiO4)3

Rough Ruby

Corundum (Al2O3 with Chromium impurities)

Fuchsite

Chromium-bearing Muscovite - K(Al,Cr)2(AlSi3O10)(OH)2

Quartzite Pebble

Metamorphic rock primarily composed of Silicon Dioxide (SiO2)

Orange Quartzita (Calcite-stained Quarzite)

Metamorphic Silicon Dioxide (SiO2) with iron/calcium inclusions

Green Quartzite (River Stone)

Metamorphic Quartz (SiO2) with inclusions (typically Fuchsite or Chlorite)

Slate

Foliated Metamorphic Rock (primarily clay minerals and micas)

Green Quartzite

Metamorphic Quartz (SiO2) with Chromium-rich inclusions (Fuchsite)

River Pebble (Gneiss or Quartzite)

Metamorphic rock specimen (likely Gneiss or impure Quartzite)

Slate River Stone

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

River Pebble (Gneiss or Quartzite variant)

Course-grained Metamorphic Rock (likely SiO2 dominant)

Slate

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

Lapis Lazuli

Na8[Al6Si6O24]Sn (Lazurite-rich metamorphic rock)

Lapis Lazuli (Raw)

Lazurite-rich metamorphic rock; Na3Ca(Al3Si3O12)S

Slate with Pyrite Inclusions

Foliated Metamorphic Rock (with Iron Sulfide FE-S2)

Slate with Quartz Vein

Foliated Metamorphic Rock (Mainly Quartz, Muscovite, Chlorite)

Green Aventurine

Quartz (SiO2) containing Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)3Si3O10(OH)2)

Ruby in Fuchsite

Corundum (Al2O3) in Chrome-Mica (K(Al,Cr)2(AlSi3O10)(OH)2)

Schist

Mica Schist

Ruby in Zoisite (Anyolite)

Anyolite (Combination of Corundum and Zoisite)

Fragmented Sedimentary Pebble

Clastic Sedimentary Specimen

Shale (Beach-worn)

Laminated Pelite (primarily clay minerals and quartz)

Quartzite

Quartzite (primarily Silicon Dioxide, SiO2)

Quartzite

Quartzite (SiO2)

Yellow Quartzite

Quartzite (SiO2 with iron oxide inclusions)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Red Quartzite

Quartzite (SiO2 with iron oxide impurities)

Quartzite

Quartzite (Primary mineral: SiO2)

Quartzite

Quartzite (SiO2)

Epidote

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

Quartzite

Quartzite (Primary mineral: Quartz, SiO2)

Yellow Quartzite Pebble

Quartzite (primarily Silicon Dioxide - SiO2)

White Marble

Recrystallized Calcite (CaCO3)

Schist (Micaceous Schist)

Micaceous schist (Mainly Muscovite/Biotite mixed with Quartz)

Greenstone

Greenschist / Greenstone (containing Chlorite, Epidote, Actinolite)

Unakite

Epidotized Granite

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (chiefly SiO2)