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Axinite is a brown to violet-brown, or reddish-brown bladed group of
mineral In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form.John P. Rafferty, ed. (2 ...
s composed of
calcium Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar ...
aluminium Aluminium (aluminum in American and Canadian English) is a chemical element with the symbol Al and atomic number 13. Aluminium has a density lower than those of other common metals, at approximately one third that of steel. It ha ...
boro __NOTOC__ Boro may refer to: People * Boro people, indigenous peoples of Amazonas, Brazil * A variant spelling for the Bodo people of northeast India * Charan Boro, Indian politician * Isaac Adaka Boro, a celebrated Niger Delta nationalist and Nig ...
-
silicate In chemistry, a silicate is any member of a family of polyatomic anions consisting of silicon and oxygen, usually with the general formula , where . The family includes orthosilicate (), metasilicate (), and pyrosilicate (, ). The name is a ...
, . Axinite is
pyroelectric Pyroelectricity (from the two Greek words ''pyr'' meaning fire, and electricity) is a property of certain crystals which are naturally electrically polarized and as a result contain large electric fields. Pyroelectricity can be described as the a ...
and
piezoelectric Piezoelectricity (, ) is the electric charge that accumulates in certain solid materials—such as crystals, certain ceramics, and biological matter such as bone, DNA, and various proteins—in response to applied mechanical stress. The word '' ...
. The axinite group includes: *Axinite-(Fe) or ferroaxinite, Ca2Fe2+Al2BOSi4O15(OH) iron rich, clove-brown, brown, plum-blue, pearl-gray *
Axinite-(Mg) Axinite-(Mg) is a borosilicate mineral of aluminum, calcium and magnesium of the axinite group, with magnesium as the dominant cation in the place of the structure that can also be occupied by iron and manganese. It was discovered in gem material ...
or magnesioaxinite, Ca2MgAl2BOSi4O15(OH) magnesium rich, pale blue to pale violet; light brown to light pink *Axinite-(Mn) or manganaxinite, Ca2Mn2+Al2BOSi4O15(OH) manganese rich, honey-yellow, clove-brown, brown to blue *Tinzenite, (CaFe2+Mn2+)3Al2BOSi4O15(OH) iron – manganese intermediate, yellow, brownish yellow-green Axinite is sometimes used as a gemstone.Tables of Gemstone Identification By Roger Dedeyne, Ivo Quintens p.147


Gallery

File:Axinite-64246.jpg, Clove-brown axinite crystals to 2.3 cm set atop matrix from the West Bor Pit at
Dalnegorsk Dalnegorsk (russian: Дальнего́рск, lit. ''far in the mountains'') is a town in Primorsky Krai, Russia. Population: Name It was formerly known from its founding in 1897 as Tetyukhe (russian: Те́тюхе; ; literally meaning "river ...
, Russia File:Axinite-60191.jpg, Chloritized bladed crystals of Axinite forming on Adularia from the
Swiss Alps The Alpine region of Switzerland, conventionally referred to as the Swiss Alps (german: Schweizer Alpen, french: Alpes suisses, it, Alpi svizzere, rm, Alps svizras), represents a major natural feature of the country and is, along with the Swis ...
File:Tinzenite-Calcite-172430.jpg, Tinzenite on Calcite, 4.5 × 3.5 × 3 cm. Wessels Mine, Kalahari manganese fields,
Northern Cape Province The Northern Cape is the largest and most sparsely populated province of South Africa. It was created in 1994 when the Cape Province was split up. Its capital is Kimberley. It includes the Kalahari Gemsbok National Park, part of the Kgalagadi ...
, South Africa File:Axinite-(Mn)-239862.jpg, Manganaxinite (Axinite-(Mn)), with sharp curving crystals to 4 cm. West Bor Pit at
Dalnegorsk Dalnegorsk (russian: Дальнего́рск, lit. ''far in the mountains'') is a town in Primorsky Krai, Russia. Population: Name It was formerly known from its founding in 1897 as Tetyukhe (russian: Те́тюхе; ; literally meaning "river ...
, Russia


References

{{Manganese minerals Calcium minerals Iron(II) minerals Manganese(II) minerals Aluminium minerals Sorosilicates Triclinic minerals Luminescent minerals Gemstones Minerals in space group 2