Banded Gneiss (with Quartz Vein)
Gneiss (Metamorphic rock of varying mineralogy)
metamorphic
Category
Mineral Like Biological Tissue
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Quartz with Iron Staining and Chlorite Inclusions
Silicon Dioxide (SiO2)
mineral
Limonite Nugget
Limonite (Hydrated iron oxide-hydroxide, FeO(OH)·nH2O)
mineral
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Fluorite
Calcium fluoride (CaF2)
mineral
Leopardite
Porphyritic Quartz Monzonite or Rhyolite
igneous
Quartz with Tourmaline inclusion (Tourmalinated Quartz)
Silicon Dioxide (SiO2) with Tourmaline inclusions
mineral
Greenstone / Epidosite
Metamorphosed Mafic Igneous Rock (Epidote-Chlorite group)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Green Aventurine
SiO2 (Quartz with Fuchsite inclusions)
mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Si,Al)4O8
mineral
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Basalt with Epidote
Mafic volcanic rock with Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
igneous
Diorite
Intermediate Phaneritic Plutonic Rock - Diorite
igneous
Kimberlite with Diamond
Kimberlite (Porphyritic Peridotite)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt
igneous
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Schist
Mica Schist
metamorphic
Lepidolite Polished Point
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Limonite
FeO(OH)·nH2O
mineral
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Blue Quartzite (Blue Aventurine)
SiO2 (Silicon Dioxide with Dumortierite/Crocidolite inclusions)
metamorphic
Gneiss
Gneiss (High-Grade Metamorphic Rock)
metamorphic
Sandstone
Arenite (lithic or quartz sandstone)
sedimentary
Petrified Wood Agate
Silicified Wood (primarily SiO2)
fossil
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Schist
Mica Schist
metamorphic
Granite
Phaneritic plutonic rock (Quartz, Alkali Feldspar, and Plagioclase)
igneous
Blue Slag Glass
Amorphous Silica (Byproduct of smelting)
Antropogenic (Man-made)
Fossil Coral / Crinoid Stem section
Anthozoa / Crinoidea fossil
fossil
Gneiss with Quartz Veining
Gneiss (High-grade metamorphic rock)
metamorphic
Limonite Concretion
Goethite/Limonite concretion (FeO(OH)·nH2O)
sedimentary
Quartz Pebble with Chlorite or Epidote Inclusions
Silicon Dioxide (SiO2) with inclusions
metamorphic
Yellow Jasper
Cryptocrystalline Quartz (SiO2) with Goethite/Limonite inclusions
sedimentary
Greenstone with Quartz Veining
Epidiorite or Metabasalt with SiO2 (Quartz) veins
metamorphic
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Sulfur (with possible Cullet Glass or Slag imitation)
Native Sulfur (S8)
mineral
Garnet Schist
Almandine-Garnet Schist
metamorphic
Pink Feldspar / Rhodochrosite (Tumbled Pink Quartzite)
SiO2 (Quartz) / KAlSi3O8 (Potassium Feldspar)
mineral
Sandstone (Quartz Sandstone / Iron-stained Sandstone)
Sandstone (SiO2 with iron oxide impurities)
sedimentary
Greenschist (Greenstone River Pebble)
Greenschist (Chlorite Schist)
metamorphic