Likely weathered metallic mineral or slag fragment
Indeterminate; possibly iron-rich sulfide/oxide material or industrial slag
mineral
Category
Mineral Composite
Browse mineral composite specimens identified by the Rock Identifier community.
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Limonite / Goethite (Ironstone Nodule)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
River Stones (Quartzite and Sandstone)
Quartzite / Sedimentary Rock (SiO2 dominant)
sedimentary
Turquoise (Dyed Howlite/Magnesite imitation)
CuAl6(PO4)4(OH)8·4H2O (Target mineral) / Ca2B5SiO9(OH)5 (Actual specimen: Howlite)
mineral
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Limonite
FeO(OH)•nH2O
mineral
Limonite or Goethite (Ironstone)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Kaolinite (China Clay)
Kaolinite (Al2Si2O5(OH)4)
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminum)
mineral
![Malachite (Copper carbonate hydroxide [Cu2CO3(OH)2]) — mineral](https://media.rockidentification.com/0ed01f12-e4f8-44fd-a6ac-1d448f78511f-thumbnail.jpg)
Malachite
Copper carbonate hydroxide [Cu2CO3(OH)2]
mineral
Tiger's Eye
Silicon Dioxide (SiO2) with fibrous inclusions
mineral
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Unidentified translucent mineral fragment, possibly calcite
Calcite (calcium carbonate, CaCO₃), tentative identification
mineral
Mixed Mineral Collection
Multi-mineral Assemblage (Quartz, Jasper, Obsidian, Pyrite, etc.)
mineral
Quartz with Mineral Inclusions
Silicon Dioxide (SiO2) with accessory minerals
mineral
Quartz Mineral Specimens
Quartz (Silicon Dioxide, SiO2)
mineral
Granite
Granite (phaneritic felsic intrusive rock)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
Igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)
mineral
Red Sandstone
Arenite (primarily Quartz with Iron Oxide coating)
sedimentary
Lapis Lazuli
(Na,Ca)8(AlSiO4)6(SO4,S,Cl)2 (Complex silicate rock)
rock
Limonite
FeO(OH)·n(H2O)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz-veined Limestone
Sedimentary limestone with quartz/calcite veinlets
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Milky Quartz with Algae/Chlorite
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Limonite (Ironstone)
Limonite (FeOO·nH2O)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
sedimentary
Sandstone (with Concretion)
Arenite / Quartzose Sandstone
sedimentary
Pyrite (on host rock)
Iron Sulfide (FeS2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Limonite (Ironstone)
Goethite/Limonite (Hydrated iron(III) oxide-hydroxide)
mineral
Selenite (Satin Spar)
Gypsum (CaSO4·2H2O)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Calcite
Calcite (Mineral; CaCO₃)
Mineral
Quartzite (with mineral vein)
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Mica Group Minerals
There isn't a single scientific name as 'Mica' refers to a group of phyllosilicate minerals. Common scientific names include Muscovite (KAl₂ (AlSi₃O₁₀)(OH)₂), Biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH)₂), Phlogopite (KMg₃AlSi₃O₁₀(OH)₂), and Lepidolite (K(Li,Al)₃(Al,Si,Rb)₄O₁₀(F,OH)₂).
Mineral