Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Category
Sedimentary (Volcanic)
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Polished orbicular jasper (likely ocean jasper)
Silicified volcanic rock; chiefly microcrystalline quartz (SiO₂), with feldspar and iron-rich alteration minerals
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Jasper Agate
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Jasper-Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Agate
Silicon dioxide (chalcedony variety), SiO2
sedimentary
Educational Geologic Collection
Mixed Mineral and Rock Collection (Various compositions)
mineral
Jasper
Silicon Dioxide (SiO2), Microcrystalline Quartz
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Geode
Quartz nodule / Chalcedony-lined cavity
sedimentary
Chalcedony (Agate nodule fragment)
Silicon Dioxide (SiO2)
mineral
Jasper
Cryptocrystalline quartz (SiO2)
Sedimentary/Mineral
Tumbled Agate
Silicon Dioxide (Chalcedony variety), SiO2
mineral
Polished red jasper beads
Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides
mineral
Native Sulfur
Sulfur (S)
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2 + impurities)
mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in a Geode
mineral
Weathered porphyritic volcanic rock (likely andesite or basalt)
Porphyritic andesite/basalt; typically plagioclase feldspar ± pyroxene, olivine, and iron oxides
igneous
Jasper / Agate (Chalcedony)
Silicon dioxide (SiO2)
sedimentary
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Chert (and Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/SiO2)
mineral
Agate Nodule / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Orbicular Rhyolite (Rainforest Jasper)
Rhyolite containing Spherulites (SiO2 with impurities)
igneous
Chalcedony
Silicon Dioxide (SiO2)
mineral
Agate
Chalcedony (SiO2)
sedimentary
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Jasper with Agate Inclusions
Silicon Dioxide (SiO2) - variety of Quartz/Chert
sedimentary
Black-and-white jasper
Jasper, microcrystalline quartz (SiO₂), with contrasting white mineral inclusions
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Agate Bookend / Quartz Geode
Silicon Dioxide (SiO2)
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Rhyolite
Rhyolite (Extrusive Igneous Rock)
igneous
White Chalcedony
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Botryoidal Quartz
Silicon Dioxide (SiO2)
mineral
Red jasper (likely brecciated or orbicular jasper)
Microcrystalline quartz, SiO₂, colored mainly by iron oxides
mineral
Red jasper (likely rough jasper/chert)
Microcrystalline quartz (SiO₂), commonly colored by iron oxides
mineral