Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Category
Sedimentary Or Metamorphic
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Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)
mineral
Amethyst and Calcite collection
Silicon Dioxide (SiO2) and Calcium Carbonate (CaCO3)
mineral
Zoisite with Hornblende
Zoisite (Ca2Al3(SiO4)3(OH)) with Amphibole inclusions
metamorphic
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Mossy Rock
Mixed lithology rock with Bryophyta (moss)
sedimentary
Limonite or Goethite (Ironstone)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Carnelian
SiO2 (Silicon Dioxide with Iron Oxide impurities)
gemstone
Chalcedony (Tumbled Pebble)
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Tiger's Eye
Silicon dioxide (SiO2) - Pseudomorph after crocidolite
mineral
Pyrite
Iron Pyrite (FeS2)
mineral
Unidentified gray-brown stone
Likely fine-grained quartz–feldspar rock; exact identification is not possible from this close, blurred image
mineral
Yellow Aventurine
Silicon Dioxide with inclusions (SiO2 + Muscovite/Fuchsite)
mineral
White Agate / Chalcedony
Silicon Dioxide (SiO2)
gemstone
Quartz Vein in Pelite (Metamorphic Rock)
Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)
metamorphic
Mixed mineral and rock collection
Predominantly quartz varieties, including amethyst, plus likely calcite, feldspar, mica, and miscellaneous polished stones
mineral
Zoisite with Rubellite (Ruby in Zoisite)
Zoisite with inclusions of Hornblende (Anyolite)
metamorphic
Chalcedony (Agate) Pebble
Silicon Dioxide (SiO2)
mineral
Light-colored pebble, likely quartzite or weathered limestone
Indeterminate from image; possible quartzite (microcrystalline SiO₂)
metamorphic
Unidentifiable Rock Fragment
Uncertain
Rounded quartz-rich cobble
Likely quartzite or quartz-rich sandstone; exact identification requires a fresh break or hardness test
sedimentary
Green Aventurine
Silicon dioxide (SiO2) with fuchsite inclusions
mineral
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Pyrite
Iron Pyrite (FeS2)
mineral
Small red-brown mineral or rock fragment
Unidentified; possibly iron-oxide-rich jasper, garnet, or weathered sulfide
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Specular Hematite with Quartz and Limonite
Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)
Mineral
Tumbled hematite (likely hematite-rich ironstone)
Hematite, Fe₂O₃; possibly mixed with magnetite or goethite
mineral
Native Silver Nugget
Silver (Ag)
mineral
Yellow Agate
Agate (Varietal form of Chalcedony/Quartz, SiO2)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Limonite pseudomorph after Pyrite
Goethite/Limonite FeO(OH)·nH2O
mineral
Jasper (Red and Yellow)
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Pyrite (FeS2)
mineral
Pyrite-bearing rock, possibly pyrite-rich schist or quartzite
Pyrite (iron disulfide, FeS₂) in a fine-grained metamorphic or quartz-rich matrix
mineral
Zoisite with Ruby (Anyolite)
Zoisite – Ca2Al3(SiO4)3(OH) with inclusions of Ruby (Al2O3:Cr)
metamorphic
Jasper
Silicon dioxide (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary