Eclogite
Eclogite (Omphacite-Garnet rock)
metamorphic
Category
Organic (Often Found By Beachcombers)
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Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Chert (often called Flint when dark)
Microcrystalline silicon dioxide (SiO2)
sedimentary
Chert (including Common Opal and Chalcedony)
Silicon Dioxide (SiO2 · nH2O)
sedimentary
Chert (variations include Flint or Jasper)
Chert (Silicon Dioxide, SiO2)
sedimentary
Granitoid (Commonly Granite)
Phaneritic Felsic Igneous Rock
igneous
Dyed Agate Geode Slice
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (Quartz-rich sedimentary rock)
sedimentary
Turquoise (Dyed Howlite/Magnesite imitation)
CuAl6(PO4)4(OH)8·4H2O (Target mineral) / Ca2B5SiO9(OH)5 (Actual specimen: Howlite)
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Baltic Amber (Butterscotch variety)
Succinite
Organic Gemstone/Mineraloid
Cordierite in Matrix (Iolite)
Magnesium iron aluminium cyclosilicate (Mg,Fe)2Al4Si5O18
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Nut
SiO2 (Silicon Dioxide)
mineral health
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Emerald
Beryl (Be₃Al₂Si₆Oထ₈) with Chromium/Vanadium impurities
gemstone
Jasper and Epidote (Unakite-like specimen)
Epidotized granite or Jasper with Epidote inclusions
metamorphic
Rhodonite
Manganese Silicate (MnSiO₃)
mineral
Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Quartz (Milky/Tan)
Silicon Dioxide (SiO2)
mineral
Copper Ore (likely Malachite or Chrysocolla staining)
Copper Secondary Mineral (e.g., Cu2CO3(OH)2)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Common Opal
Hydrated Silica (SiO2·nH2O)
mineral
Chalcedony
Chalcedony (SiO2)
mineral
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Rhodonite
Manganese silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Tumbled Clear Quartz and Citrine Points
Silicon Dioxide (SiO2)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Ruby in Zoisite (Anyolite)
Corundum var. Ruby in Zoisite (Al2O3 + (Ca2Al3(SiO4)3(OH)))
metamorphic
Magnetite / Hematite rich ore
Magnetite (Fe3O4) or Hematite (Fe2O3)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary