Agate Geode
Cryptocrystalline Quartz (SiO2) with Chalcedony banding
mineral
Category
Mineralogical Specimen
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Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Vein Quartz in Basalt or Chert
Silica-veined dark lithic rock (Quartz veins in microcrystalline matrix)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Copper-bearing Quartz Vein in Host Rock
Quartz with Malachite/Chrysocolla staining
igneous/metamorphic with mineral
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Spinosaurus Tooth Fossil
Spinosaurus aegyptiacus (Calcium Phosphate/Apatite)
sedimentary
Rugose Coral Fossil
Rugosa (Order)
sedimentary
River Stone (possibly Gneiss)
Metamorphic Gneiss
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite with Hematite staining
Metamorphic Quartzite (SiO2)
metamorphic
Not a rock, mineral, or geological specimen
N/A
Calcite specimen
Calcite (calcium carbonate, CaCO₃), likely botryoidal or drusy calcite
mineral
Banded Serpentinite with Calcite Veins
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Epidosite with Quartz (Unakite-variant or Jasper)
Epidotized Metasomatite
metamorphic
Smoky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Faceted)
Silicon dioxide (SiO2)
gemstone
Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
gemstone
Diamond inlaid in Jewelry
Carbon (C)
mineral
Sandstone with Quartz Vein
Arenite with SiO2 intrusion
sedimentary
Clear Quartz Crystal (Likely Golden Healer/Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Chert (Carnelian/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Vuggy Limestone
Carbonate Sedimentary Rock with Vuggy Porosity (CaCO3)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Shale (with Iron Staining)
Argillaceous mudstone / Shale
sedimentary
Sulfur-bearing Limestone (Solfatara Specimen)
Sulfur-rich Bio-limestone (Calcium Carbonate with Native Sulfur, S8)
sedimentary
Blue Grey Agate Geode
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Quartz Vein in Matrix
Silicon Dioxide (SiO2) within Rhyolitic or Granitic Matrix
igneous
Smoky quartz (likely)
Quartz, silicon dioxide (SiO₂)
mineral
Chalcopyrite
CuFeS2 (Copper Iron Sulfide)
mineral
Quartz Druse on Basalt Matrix
Silicon Dioxide (SiO2)
mineral
Banded Agate (with Quartz Geode Center)
Silicon Dioxide (SiO2)
mineral
Unidentified weathered rock, possibly quartz-bearing granite or rhyolite
Indeterminate; likely quartz–feldspar-rich silicate rock
igneous
Unidentifiable Specimen
Undetermined
Unknown
Limonitic Sandstone with Inclusion
Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Mixed Rock Collection
Polylithic Geological Specimen Mix
sedimentary and igneous
River Stone (Sedimentary Sandstone/Quartzite)
Arenite/Quartzite transition specimen
sedimentary
Quartz with Mica/Schist inclusion
Silicon Dioxide (SiO2) with Phyllosilicates
mineral
Fossiliferous Limestone
Bioclastic Limestone (CaCO3)
sedimentary