Epidote with Quartz Vein
Epidote-bearing metamorphic rock with quartz (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
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Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite or arkose)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Lake Superior Agate
Silicon dioxide (Chalcedony / Quartz)
sedimentary
Petrified Wood
Silicified wood (Quartz / Chalcedony replacement of organic cellulose)
fossil
Pebble
Lithic fragment / Rounded rock fragment
sedimentary
Greenstone
Metamorphic Rock (Greenschist facies)
metamorphic
Crinoid Stem Fossil
Crinoid columnal (Echinodermata)
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Basalt
Extrusive Igneous Rock
igneous
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Limestone
Sedimentary carbonate rock (CaCO3)
sedimentary
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Basalt
Mafic extrusive igneous rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Basalt
Extrusive igneous rock
igneous
Jasper and Agate (Polychrome Jasper / Mookaite variety)
Silicon dioxide (SiO2) microcrystalline quartz
sedimentary
Basalt
Mafic extrusive igneous rock
igneous
Banded Gneiss
Gneiss (Metamorphic rock)
metamorphic
Basalt
Extrusive Igneous Rock
igneous
Sandstone (Banded)
Sedimentary Clastic Rock
sedimentary
Heliotrope (Bloodstone)
Chalcedony variety Quartz (SiO2) with hematite/chlorite inclusions
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Basalt Pebble
Extrusive Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Generic Pebble / Small Rock Fragment
Lithic fragment / Weathered rock particle
sedimentary
Sandstone (Tumbled / Rounded)
Sedimentary Rock (Quartz arenite)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Basalt
Extrusive igneous rock
igneous
Seashell Fragment
Calcium carbonate (CaCO3) - primarily Aragonite or Calcite
fossil
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone pebble
Sedimentary rock, primarily calcium carbonate (CaCO3)
sedimentary
Fulgurite
Lechatelierite (Silica glass)
mineral
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Basalt
Extrusive Igneous Rock
igneous
Petoskey Stone
Hexagonaria percarinata
fossil
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Kidney Stone
Calculus (Calcium oxalate/Calcium phosphate)
mineral