Basalt River Stone
Extrusive mafic igneous rock (Basalt)
igneous
Category
Not A Geological Specimen
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Diamond (as set in a metal alloy ring)
Diamond (Pure Carbon, C)
mineral
Shiva Lingam
Cryptocrystalline Quartz (Jasper) with Iron Oxide inclusions
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Flint or Common Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Mixed Mineral Collection (with Titanium Aura Quartz)
Silicon Dioxide (SiO2) with metallic coatings and various silicates
mineral
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Citrine
Citrine (Silicon Dioxide, SiO2)
mineral
Porphyritic Basalt
Basalt (with plagioclase or k-feldspar phenocrysts)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite with Iron Inclusions
Metamorphosed Quartz Sandstone (SiO2 with Fe2O3)
metamorphic
Quartz (Water-worn Pebble)
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (dominated by Plagioclase and Pyroxene)
igneous
Quartz Crystal Fragment
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Common Opal mix)
Microcrystalline Quartz (SiO2)
sedimentary
Smoky Quartz in Matrix
Silicon dioxide (SiO2) within Pegmatite/Gneiss
igneous
Quartz with Mafic Inclusions
Silicon Dioxide (SiO2) with host igneous matrix
igneous
Chert with Jasper and Quartz
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Red Jasper (with Quartz and Chert)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Diorite
Diorite (intermediate intrusive igneous rock)
igneous
Lepidolite in Quartz Matrix
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Chert (Banded)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite (or Massive Quartz)
Silicon Dioxide (SiO2)
metamorphic
Chert (with Manganese Oxide coating)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (potentially Jasper/Common Opal mixture)
Microcrystalline Quartz (SiO2)
sedimentary
Greenish rock with white veins, possibly epidote or chlorite bearing rock with quartz/calcite veins
Altered mafic rock or Epidosite
metamorphic or igneous alteration
Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite pebble
Quartzite (SiO2 based)
metamorphic
Sandstone (Ferruginous)
Arenite (iron-rich)
sedimentary
Clear Quartz Crystal (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral
Granite
Granite
igneous
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Amethyst Quartz Crust
Crystalline Silicon Dioxide with Iron impurities (SiO2)
mineral
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Oolitic Limestone (Oolite)
Oolitic Limestone (primarily Calcium Carbonate, CaCO3)
sedimentary
Amethyst (Tumbled Stone)
Amethyst (Silicon Dioxide with Iron impurities, SiO2)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartz with Mica/Host Rock
Silicon Dioxide (SiO2) with Phyllosilicates
mineral