Axinite

Axinite
Axinite – Deposit Topotype, France
General
Category	Borosilicates
Chemical formula	(Ca,Fe,Mn)3Al2BO3Si4O12OH or Ca2(Fe,Mn)Al2BSi4O15(OH)
Identification
Color	Reddish brown to yellow to colorless. Blue, violet, grey.
Crystal habit	Tabular, wedge shaped crystals
Crystal system	Triclinic
Cleavage	Good on {100}
Fracture	Conchoidal
Mohs scale hardness	6.0–7.5
Luster	Vitreous
Streak	White
Specific gravity	3.18–3.37
Optical properties	Biaxial (-)
Refractive index	nα = 1.672–1.693 nβ = 1.677–1.701 nγ = 1.681–1.704
Birefringence	δ = 0.011
Pleochroism	Strong
References	[1][2]

Axinite is a brown to violet-brown, or reddish-brown bladed group of minerals composed of calcium aluminium boro-silicate, (Ca,Fe,Mn)₃Al₂BO₃Si₄O₁₂OH. Axinite is pyroelectric and piezoelectric.

The axinite group includes:^[1]

• Axinite-(Fe), ferro-axinite, iron rich, lilac brown to black
• Axinite-(Mg), magnesio-axinite, magnesium rich, pale blue to gray
• Axinite-(Mn), manganaxinite, manganese rich, yellow-orange
• Tinzenite, iron – manganese intermediate, yellow

Gallery

• 

  Clove-brown axinite crystals to 2.3 cm set atop matrix from the West Bor Pit at Dalnegorsk, Russia

• 

  Chloritized bladed crystals of Axinite forming on Adularia from the Swiss Alps

References

1. ^ ^{a b} Axinite. Mineral Galleries
2. ^ Axinite. Mindat

This article about a specific silicate mineral is a stub. You can help Wikipedia by expanding it.v · Categories: Calcium minerals Iron minerals Manganese minerals Aluminium minerals Sorosilicates Triclinic minerals Silicate mineral stubs Wikimedia Foundation. 2010. Игры ⚽ Поможем написать курсовую Steven Brams GusGus Look at other dictionaries: Axinite — Catégorie IX : silicates[1] Axinite, St Christophe en Oisans (6cm) …   Wikipédia en Français axinite — ● axinite nom féminin (grec aksinê, hache) Borosilicate d aluminium, de fer, de manganèse, de calcium, triclinique. ⇒AXINITE, subst. fém. MINÉR. Substance minérale (borosilicate de calcium, de manganèse, de fer et d aluminium) à cristaux… …   Encyclopédie Universelle Axinite — Ax i*nite, n. [Named in allusion to the form of the crystals, fr. Gr. ? an ax.] (Min.) A borosilicate of alumina, iron, and lime, commonly found in glassy, brown crystals with acute edges. [1913 Webster] …   The Collaborative International Dictionary of English axinite — |acsi| s. f. [Mineralogia] Espécie de turmalina violácea.   ♦ Grafia no Brasil: axinita …   Dicionário da Língua Portuguesa axinite — /ak seuh nuyt /, n. a mineral, complex calcium and aluminum borosilicate, usually occurring in thin brown crystals. [1795 1805; < Gk axín(e) AX + ITE1] * * * ▪ mineral       borosilicate mineral that occurs most commonly in contact metamorphic… …   Universalium axinite — aksinitas statusas T sritis chemija apibrėžtis mineralas formulė Ca₂(Fe,Mg,Mn)Al₂B[OH|O|(Si₂O₇)₂] atitikmenys: angl. axinite rus. аксинит …   Chemijos terminų aiškinamasis žodynas axinite — noun A borosilicate of aluminum, iron, and lime, commonly found in glassy, brown crystals with acute edges …   Wiktionary axinite — (entrée créée par le supplément) (a ksi ni t ) s. f. Substance minérale qui cristallise en forme de hache. ÉTYMOLOGIE    Du grec, hache …   Dictionnaire de la Langue Française d'Émile Littré axinite — ax·i·nite …   English syllables axinite — ˈasksəˌnīt noun ( s) Etymology: French, from Greek axinē axhead, ax + French ite; from its ax shaped crystals : a mineral Ca2(MnFe)Al2BSi4O15OH, consisting of borosilicate of aluminum and calcium with varying amounts of iron and manganese… …   Useful english dictionary 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”