Granite or Granitic Gneiss
Granitoid / Gneiss
Igneous / Metamorphic
Category
Mineral Health
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Gneiss
High-grade regional metamorphic rock
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Gold (Elemental Metal)
Gold (Au)
Mineral
Sandstone and Quartzite Specimens
SiO2 with varying mineral/clastic inclusions
sedimentary/metamorphic
Quartzite (River Cobble)
Quartzite (dominant mineral: Quatrz, SiO2)
metamorphic
Quartzite
Quartzite (Primary mineral: Quartz, SiO2)
metamorphic
Charoite
Charoite (Complex silicate mineral rock)
metamorphic
River Pebble (Brecciated Chert/Siltstone)
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Green Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Sandstone
Arenite (SiO2 based with mineral cement)
sedimentary
Fancy Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Black Jasper
Black Jasper (Silicate mineral - SiO2)
sedimentary
Goldstone
Not a natural mineral or rock. It is an ornamental glass.
Manufactured Glass (Simulant)
Quartzite
Quartzite (Primary mineral: Quartz, SiO2)
metamorphic
Concrete Fragment
Hardened Portland cement and mineral aggregate
sedimentary (anthropogenic)
Copper-bearing Quartz (with Malachite and Iron Oxides)
Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)
Mineral Specimen
Diorite
Phaneritic intermediate plutonic rock (Diorite)
igneous
Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Lapis Lazuli
Lapis Lazuli (Complex aggregate containing Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)
metamorphic
Dyed Agate
Chalcedony (SiO2)
mineral
Fossilized Bone Chunk (likely Dinosaur or Large Mammal)
Permineralized Fossil Bone
sedimentary
Limonite after Pyrite (Prophecy Stone or Ironstone Concretion)
Goethite/Limonite pseudomorph after Pyrite/Marcasite (FeO(OH)·nH2O)
mineral
Pyrite in Shaly Matrix
Iron Sulfide (FeS2)
mineral
Agate
Agate (Chalcedony), SiO2
Mineral
Carnelian Agate
Red Chalcedony (SiO2 with Iron Oxide impurities)
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Pegmatite (with smoky quartz and tourmaline/biotite)
Pegmatitic Granite
igneous
Epidote in Matrix (likely Amphibolite or Gneiss)
Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)) in Metamorphic Matrix
metamorphic
Quartz-Veined Mudstone
Argillaceous Mudstone with Quartz Veining
sedimentary
Goldstone (Brown/Gold variety)
Aventurine Glass (SiO2 with Copper inclusions)
Synthetic/Man-made glass (often mistaken for a mineral)
Vesicular Basalt with Mineral Inclusions
Vesicular Basalt
igneous
Diamond (or Diamond Simulant)
Carbon (C)
mineral
Copper and Quartz beads
Native Copper (Cu) and Crystalline Quartz (SiO2)
mineral
Quartz (Citrine or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Lapis Lazuli (Low Grade)
Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)
metamorphic
Quartz (Small Grains)
Silicon Dioxide (SiO2)
mineral
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral