Petoskey Stone / Rugose Coral Fossil
Hexagonaria percarinata
fossil
Category
Man Made Object (Metalwork)
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Likely blue glass or synthetic gemstone jewelry
Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass
gemstone
Fossil Coral
Scleractinia (Stony Coral) fossil
fossil
Red Sandstone
Quartz Arenite (iron-stained) / SiO2
sedimentary
Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Granite
Granite (a plutonic rock)
Igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Bloodstone
Chalcedony (Variety Heliotrope), SiO2
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Quartz (Jasper / Chert)
Silicon Dioxide (SiO2)
sedimentary
Green Jade
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)
gemstone
Hematite Nodule / Concretion
Hematite (Fe2O3)
mineral
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz)
sedimentary
Tumbled carnelian/chalcedony
Cryptocrystalline quartz, SiO₂ (iron-bearing chalcedony)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Jasper
Silicon Dioxide (SiO2), microcrystalline quartz
sedimentary
Petrified Wood
Silicified wood / Permineralized wood (SiO2)
fossil
Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Labradorite (Tumbled)
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
mineral
Quartz with Matrix
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Jasper in Quartz / Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Green Aventurine
Quartz variety with fuchsite inclusions (SiO2)
mineral
White Jade
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)
gemstone
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Green Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Green Aventurine
Quartz variety (SiO2) with fuchsite inclusions
mineral
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary