There are 60 minerals that start with the letter X. From Xancabraite to Xyromagnesite. Minerals are naturally occurring, inorganic solids with a defined chemical composition and a crystalline structure. They are the building blocks of rocks and are classified based on their chemical properties, crystal structure, and texture. Minerals form through a variety of geological processes, including crystallization from molten rock, precipitation from solutions, and metamorphism under high pressure and temperature. They are essential not only for geological processes but also for many industrial applications and are critical for life, serving as nutrients in biological systems.

An intriguing fact about minerals is that some larval insects use mineral particles from the environment to enhance their camouflage, adapting to their surroundings for protection against predators. This innovative use of minerals demonstrates the complex interactions between organisms and their natural habitats.

Here’s what each of the columns in the table means:

Column Name: This column indicates the specific chemical elements or compounds that make up the mineral, defining its identity and properties.

Mohs hardness: This column provides a numerical scale from 1 to 10 that ranks the hardness of the mineral based on its ability to scratch or be scratched by other substances.

Common uses: This column outlines the various applications or industries where the mineral is utilized, highlighting its practical importance in everyday life and technology.

Description: This column includes a brief overview of the mineral’s appearance, characteristics, and unique features, providing essential information for identification and understanding its role in geology and industry.

Minerals That Start With X

Minerals chemical composition Mohs hardness common uses
Xancabraite Pb2(UO2)2(VO4)2�6-8H2O 3-4(3.5) Indicative of uranium deposits.
Xanite Ca(UO2)2(VO4)2�6-8H2O 2-3(2.5) none
Xanthiosite (Zn,Fe)SO4�7H2O 2-3(2.5) None
Xanthocalite Ca(UO2)2(VO4)2�6-8H2O 2-3(2.5) None
Xanthocerite (Ca,Ce,La)Al3(PO4)2(OH)6 4-5(4.5) research
Xanthochdroite (Mn2+,Fe2+)(V5+O4) 4-5(4.5) none
Xanthoconite Cu3AsS4 2.5-3.0 Rare mineral collector’s item
Xanthocyanite KNa3(UO2)2(VO4)2�6-8H2O 2-3(2.5) none
Xanthophyllite Ca2Mg5Al2Si8O22(OH)2 6.0-6.5 Gemstone, collector’s item
Xanthoprosite (Na,Ca,Ce)AlSi2O6(OH) 5-6(5.5) none
Xanthopsite Ca(UO2)2(VO4)2�6-8H2O 2.0-3.0 Radioactive mineral specimen
Xanthosiderite Fe3+O(OH) 4-5(4.5) Pigment
Xanthoxenite Ca(V,Ti)4+O8 5-6(5.5) Used in the production of ceramic and glass products.
Xanthoxylite Cu2+x(AsO4)(OH) 3.5-4.0 Mineral specimen
Xanthroxylite Cu2+x(AsO4)(OH) 3.5-4.0 Mineral specimen
Xanzhiite Ca(UO2)2(VO4)2�6-8H2O 2.5-3(2.75) Radioactive mineral
Xaronosite (K,Na)Fe3+3(SO4)2(OH)6 2-3(2.5) None
Xavoite Ca(UO2)2(VO4)2�6-8H2O 2-3(2.5) none
Xedapalite Cu(UO2)2(VO4)2�8-10H2O 2-3(2.5) none
Xehoelingite (Mn,Fe)2+2(AsO4)2�4H2O 3(3.0) None
Xenaspidine Ca2Mg5(AsO4)4(OH)4 5(5.0) None
Xeno-tungstite Cu2+[(UO2)2(VO4)2]�6-8H2O 3-4(3.5) Indicative of uranium deposits.
Xenochronite CaPO4F 5.0-5.5 Mineral specimen
Xenochronite-(Ce) (Ce,La,Nd,Pr)AlO3 7.5-8(7.75) None
Xenoclasite (Ca,Na,Ce)2(UO2)2(VO4)2�6-8H2O 2-3(2.5) none
Xenocryst A foreign mineral crystal in an igneous rock. N/A N/A
Xenocryst-peridotite (Mg,Fe)2SiO4 6.5-7(6.75) None
Xenohalite NaCaClF 2-3(2.5) Not commonly used.
Xenoklastite SiO2 7(7.0) None
Xenolimestone CaCO3 3(3.0) None
Xenolite Xenotopia Xeroflite Xilotepecite
Xenolith-peridotite (Mg,Fe)2SiO4 6.0-7.0 Mineral specimen
Xenolithe Variable Variable Mineral specimen
Xenomorfic-equigranular SiO2 7(7.0) None
Xenomorphite Mg[(UO2)2(VO4)2]�6-8H2O 3-4(3.5) Indicative of uranium deposits.
Xenoplorite CaMg(CO3)2 3.0-4.0 Mineral specimen
Xenotime YPO4 5-5.5(5.0) Used in the production of specialty ceramics and as a source of yttrium.
Xenotime-(Nd) NdPO4 5.0-5.5 Mineral specimen
Xenotime-(Y) YPO4 5-5.5(5.0) Used in the production of specialty ceramics and as a source of yttrium.
Xenotime-enriched granite SiO2, (Y,REE)PO4, other minerals 6-7(6.5) Radioactive mineral
Xeramate KAl2(SO4)2(OH)4 3.5-4(3.75) None
Xingzhongite Cu2+2Cu+2(VO4)2�5-6H2O 3-4(3.5) None
Xipoite Cu2+3(AsO4)(OH)3 3.5-4(3.75) None
Xocolatlite Mn2(UO2)2(VO4)2�6-8H2O 3-4(3.5) Indicative of uranium deposits.
Xocomecatlite Pb2Cu(AsO4)2(OH) 3.5-4(3.75) None
Xonolite Ca6Si6O17(OH)2 5-6(5.5) Construction material
Xonotlite Ca6Si6O17(OH)2 5-6(5.5) Used in the production of cement and as a source of calcium silicate.
Xsilicite Al2SiO5 6-7(6.5) None
Xtobactellite CuS 2-3(2.5) None
Xuchengite (Zn,Cu)5(VO4)2(OH)4 4-5(4.5) None
Xylite (Mg,Fe)2+SiO4 6-7(6.5) None
Xylonite (Ca,Ce,La)(Al,Fe)3(SiO4)3(OH) 6-7(6.5) None
Xylonium (Ca,Ce,La)(Al,Fe)3(SiO4)3(OH) 6-7(6.5) None
Xylopal SiO2�nH2O 5-6(5.5) None
Xylotile Mg3Si2O5(OH)4 2.5-3(2.75) None
Xylotravertine CaCO3 3-4(3.5) Construction material
Xylotruncatite Cu+Cu2+2(AsO4)2(OH)2 3.5-4(3.75) None
Xyphosite (Ca,Ce,La)(Al,Fe)3(SiO4)3(OH) 6-7(6.5) None
Xyridite Fe3+2(AsO4)(OH) 4-5(4.5) None
Xyromagnesite Mg(CO3)(OH) 3-4(3.5) None

Descriptions

Xancabraite
A rare uranyl vanadate mineral that forms yellow to greenish-yellow crystals. It is found in oxidized uranium deposits.
Xanite
A rare uranium vanadate mineral found in oxidized uranium deposits. Forms yellow to greenish-yellow prismatic crystals.
Xanthiosite
A rare hydrous zinc sulfate mineral that forms yellowish-white to yellow prismatic crystals or crusts.
Xanthocalite
A rare yellow to yellowish-green uranium vanadate mineral that forms tabular to prismatic crystals.
Xanthocerite
A rare cerium-rich phosphate mineral that forms yellow to orange prismatic crystals. Typically found in pegmatites and granitic rocks.
Xanthochdroite
A rare vanadium mineral that forms yellow to orange-yellow prismatic crystals. Typically found in oxidized vanadium deposits.
Xanthoconite
A rare copper arsenic sulfide mineral that forms yellow to orange-yellow crystals.
Xanthocyanite
A rare uranium vanadate mineral that forms bright yellow to yellowish-green prismatic crystals. Found in uranium-bearing deposits.
Xanthophyllite
A rare magnesium-rich silicate mineral that forms yellow to green prismatic crystals.
Xanthoprosite
A rare cerium-bearing silicate mineral that forms yellow to greenish-yellow prismatic crystals. Found in alkaline igneous rocks.
Xanthopsite
A rare uranium vanadate mineral that forms yellow to greenish-yellow crystals.
Xanthosiderite
An iron oxyhydroxide mineral that forms yellow to brownish-yellow crystals or earthy masses.
Xanthoxenite
A rare vanadium-bearing mineral that forms yellow to orange-brown crystals. It is found in metamorphic and hydrothermal veins.
Xanthoxylite
A rare copper arsenic hydroxide mineral that forms emerald-green to yellowish-green crystals.
Xanthroxylite
A rare copper arsenic hydroxide mineral that forms emerald-green to yellowish-green crystals.
Xanzhiite
A hydrous calcium uranyl vanadate mineral, typically forming yellow to orange crystalline masses.
Xaronosite
A hydroxylated potassium iron sulfate mineral, often forming yellow to brown crystalline masses.
Xavoite
A rare uranium vanadate mineral that forms bright yellow to greenish-yellow prismatic crystals. Found in oxidized uranium deposits.
Xedapalite
A rare copper uranium vanadate mineral that forms bright yellow to greenish-yellow prismatic crystals. Typically found in oxidized copper-uranium deposits.
Xehoelingite
A hydrous manganese-iron arsenate mineral, typically forming green to yellow crystalline aggregates.
Xenaspidine
A calcium-magnesium arsenate hydroxide mineral, usually forming green to blue-green prismatic crystals.
Xeno-tungstite
A rare uranyl vanadate mineral that forms yellow to greenish-yellow crystals. It is found in oxidized uranium deposits.
Xenochronite
A rare calcium phosphate fluoride mineral that forms colorless to pale yellow crystals.
Xenochronite-(Ce)
A cerium aluminum oxide mineral, crystallizing in the orthorhombic system as yellow to brown prismatic crystals.
Xenoclasite
A rare uranium vanadate mineral that forms bright yellow to greenish-yellow prismatic crystals. Found in oxidized uranium deposits.
Xenocryst
A mineral grain or crystal that is foreign to the rock in which it is found, typically indicating a complex geological history.
Xenocryst-peridotite
A type of peridotite rock that contains foreign mineral crystals (xenocrysts) embedded in a finer-grained matrix.
Xenohalite
A rare halide mineral that forms colorless to white, transparent crystals. It is found in evaporite deposits.
Xenoklastite
A type of sedimentary rock composed of angular mineral or rock fragments derived from preexisting sources.
Xenolimestone
A type of metamorphic rock formed from the alteration of limestone that contains foreign mineral inclusions or xenoliths.
Xenolite
Ximengite
Xenolith-peridotite
A rare ultramafic rock xenolith composed primarily of the mineral olivine.
Xenolithe
A mineral fragment that is foreign to the rock in which it is embedded, often used in petrographic analysis.
Xenomorfic-equigranular
A type of granitic rock texture characterized by irregularly shaped mineral grains of approximately equal size.
Xenomorphite
A rare uranyl vanadate mineral that forms yellow to greenish-yellow crystals. It is found in oxidized uranium deposits.
Xenoplorite
A rare calcium magnesium carbonate mineral that forms white to pale green crystals.
Xenotime
A rare phosphate mineral that forms yellow to reddish-brown tetragonal crystals. It is found in granitic rocks and pegmatites.
Xenotime-(Nd)
A rare neodymium phosphate mineral that forms yellowish-brown to reddish-brown crystals.
Xenotime-(Y)
A rare phosphate mineral that forms yellow to reddish-brown tetragonal crystals. It is found in granitic rocks and pegmatites.
Xenotime-enriched granite
A granitic rock that is enriched in the rare-earth phosphate mineral xenotime, which can be a source of yttrium and other rare-earth elements.
Xeramate
A potassium aluminum sulfate hydroxide mineral, typically forming white to pale yellow crystalline masses.
Xingzhongite
A hydrous copper vanadate mineral, often forming blue to green crystalline aggregates.
Xipoite
A copper arsenate hydroxide mineral, usually occurring as blue to green crystalline crusts or masses.
Xocolatlite
A rare uranyl vanadate mineral that forms chocolate-brown to dark brown crystals. It is found in oxidized uranium deposits.
Xocomecatlite
A lead copper arsenate hydroxide mineral, often occurring as blue to green crystalline crusts or masses.
Xonolite
A calcium silicate hydroxide mineral, usually forming white to gray fibrous or lamellar masses.
Xonotlite
A rare silicate mineral that forms white to gray, fibrous or bladed crystals. It is found in metamorphic and hydrothermal environments.
Xsilicite
A polymorph of aluminum silicate, typically forming colorless to white, transparent to translucent prismatic crystals.
Xtobactellite
A copper sulfide mineral, forming dark gray to black, earthy or massive crystalline aggregates.
Xuchengite
A zinc-copper vanadate hydroxide mineral, often occurring as green to blue-green crystalline crusts or masses.
Xylite
A magnesium-iron silicate mineral, typically forming yellow to green, prismatic to fibrous crystals.
Xylonite
A calcium cerium aluminum iron silicate hydroxide mineral, usually occurring as colorless to pale yellow, prismatic crystals.
Xylonium
A calcium cerium aluminum iron silicate hydroxide mineral, typically forming colorless to pale yellow, prismatic crystals.
Xylopal
A variety of opal that forms as a replacement or infilling of fossil wood, often retaining the original wood texture and structure.
Xylotile
A magnesium silicate hydroxide mineral, typically forming white to greenish, fibrous or asbestiform masses.
Xylotravertine
A type of travertine formed by the precipitation of calcium carbonate around or within decaying plant matter, resulting in a distinctive ‘woody’ appearance.
Xylotruncatite
A copper arsenic hydroxide mineral, usually occurring as blue to green, lamellar or acicular crystals.
Xyphosite
A calcium cerium aluminum iron silicate hydroxide mineral, often forming colorless to pale yellow, prismatic crystals.
Xyridite
An iron arsenic hydroxide mineral, typically forming yellow to brown, earthy or massive aggregates.
Xyromagnesite
A magnesium carbonate hydroxide mineral, often forming white to pale green, fibrous or lamellar masses.

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