Hematite
Hematite (Iron(III) oxide, Fe2O3)
mineral
Category
Sedimentary (With Some Aspects Of Mineral Replacement)
Browse sedimentary (with some aspects of mineral replacement) specimens identified by the Rock Identifier community.
Gneiss
Gneiss (a metamorphic rock)
Metamorphic
Diopside (likely Chromian Diopside)
Diopside, part of Clinopyroxene family of inosilicates. Chemical formula: CaMgSi2O6. The green variety is often Chromian Diopside due to chromium impurities.
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Limonite (Iron Stone/Ocher)
Limonite (FeO(OH)·nH2O)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (a rock type, not a specific mineral with a formula)
Metamorphic Rock
Jasper
Silicon dioxide (SiO2)
sedimentary
Satin Spar (Selenite)
Gypsum (CaSO4·2H2O)
mineral
Jade
There are two distinct minerals commonly known as Jade: Nephrite (a calcium magnesium silicate - Ca2(Mg,Fe)5Si8O22(OH)2) and Jadeite (a sodium aluminum silicate - NaAlSi2O6). Based on the image showing a typically softer, more fibrous appearance, it is likely Nephrite.
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Quartz Geode Fragment
Silicon Dioxide (SiO2)
sedimentary
Selenite (Satin Spar)
Gypsum (CaSO4·2H2O)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Agate (Dyed)
Silicon Dioxide (SiO2)
Sedimentary (formed from silica deposits)
Smoky Quartz
Smoky Quartz (SiO ₂)
Mineral
Granite
Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Sandstone
Arenite (Siliclastic sedimentary rock), SiO2 + various minerals
sedimentary
Rose Quartz
Quartz (SiO2) with trace impurities causing pink color
Mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Biotite Mica
K(Mg,Fe2+)3(Al,Fe3+)Si3O10(OH,F)2
Mineral
Green Tourmaline (Verdelite)
Tourmaline Group; often Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4) or Dravite (NaMg3Al6(BO3)3Si6O18(OH)4)
Mineral
Blue Tiger's Eye
Riebeckite (crocidolite variety)
Mineral
Pink Satin Spar (Satin Spar Selenite Dyed)
Gypsum (CaSO4·2H2O)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Howlite
Howlite (Ca2B5SiO9(OH)5)
mineral
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
sedimentary
Botryoidal Goethite
Goethite (α-Fe3+O(OH))
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Limonite (Yellow Ochre)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Blue Howlite (Dyed)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Pyrite (on Shale/Matrix)
Iron Disulfide (FeS2)
mineral