Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Category
Igneous Or Mineral
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Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Labradorite
(Ca, Na)(Al, Si)4O8
mineral
Clear Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Chromite
Chromite (FeCr2O4)
mineral
Rhodolite Garnet
Mg3Al2(SiO4)3 - Fe3Al2(SiO4)3 (Pyrope-Almandine series)
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Pyrite and Quartz Agglomerate
Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Pink Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Milky quartz pebble
Quartz (silicon dioxide, SiO₂)
mineral
Amygdaloidal Basalt
Extrusive Igneous Rock with Secondary Mineral Fillings
igneous
Quartz with Mica/Host Rock
Silicon Dioxide (SiO2) with Phyllosilicates
mineral
Granite
Intrusive igneous rock
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rhyolite
Extrusive igneous rock (felsic)
igneous
Gabbro (River Cobble)
Gabbro (mafic intrusive rock)
igneous
Vesicular basalt
Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine
igneous
Banded Gneiss
Gneiss
metamorphic
Basalt with Phenocrysts
Extrusive Igneous Rock
igneous
Obsidian
Volcanic Glass (Amorphous silicon dioxide with impurities)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Intrusive Igneous Rock
igneous
Granite pebble
Granite; predominantly quartz, feldspar, and mica
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt (containing quartz/agate or zeolite fill)
igneous
Quartz
SiO2 (Silicon Dioxide)
mineral
Amazonite
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Quartz Crystal Cluster / Quartzite
Silicon Dioxide (SiO2)
mineral
Quartz with Matrix
Silicon Dioxide (SiO2)
mineral
Labradorite
(Ca, Na)(Al, Si)4O8 (Plagioclase Feldspar)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Small rough mineral/rock fragment
Indeterminate; possibly quartz-bearing rock or weathered feldspar
mineral
Epidote
Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
mineral
Smoky Quartz with Feldspar
SiO2 (Quartz) with KAlSi3O8 (Feldspar)
mineral
Quartz (Milky and Smoky variety)
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Granitoid (Plagioclase, Alkali feldspar, Quartz, Biotite/Amphibole)
igneous
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral