Clear Quartz
Silicon Dioxide (SiO2)
Mineral
Category
Sedimentary Or Metamorphic
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Calcite
Calcium Carbonate (CaCO3)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Banded Marble
Recrystallized Calcite (CaCO3)
metamorphic
Schist
Mica Schist
metamorphic
Quartzite Beach Pebble
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Biotite Schist
Biotite Mica Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (complex metamorphic silicate rock)
metamorphic
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Yellow Aventurine (or Citrine-colored Quartz)
Silicon Dioxide (SiO2) with inclusions
metamorphic
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Banded Slate (Sedimentary Pebble)
Slate (Metamorphosed Shale or Mudstone)
metamorphic
Gneiss (Green Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Siltstone or Fine-grained Sandstone pebble
Siltstone (primarily SiO2 with clay minerals)
sedimentary
Kyanite in Quartz
Al2SiO5 in SiO2
metamorphic
Gneiss
Gneiss
metamorphic
Black Agate
Silicon Dioxide (SiO2) with carbon/iron inclusions
sedimentary
Quartz Sand Gravel
Silicon Dioxide (SiO2)
sedimentary
Kyanite
Kyanite (Al2SiO5)
mineral
Yellow Quartzite Pebble
Quartzite (SiO2)
metamorphic
Greenstone (Epidosite / Chlorite Schist)
Metabasalt (often contains Epidote Ca2Al2(Fe3+,Al)(SiO4)(Si2O7)O(OH) or Chlorite)
metamorphic
Greenschist
Chlorite schist
metamorphic
Phyllite
Phyllite
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Greenstone
Greenschist / Meta-basalt
metamorphic
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Quartzite (Yellow/Orange variety)
Quartzite (primarily SiO2)
metamorphic
Marble
Recrystallized Calcite / Dolomite (CaCO3)
metamorphic
Granitic Gneiss
Gneiss (containing Potassium Feldspar and Quartz)
metamorphic
Gneiss
Gneiss
metamorphic
Marble
Metamorphosed Limestone (CaCO3)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2)
metamorphic