Axinit
| Axinit | |
 Manganaxinit | |
| Kategori | Cyklosilikater |
|---|---|
| Grupp | Astrofyllit |
| Strunz klassificering | 9.BD.20 |
| Kemisk formel | (Ca,Fe,Mn)3Al2BO3Si4O12OH eller Ca2(Fe,Mn)Al2BSi4O15(OH) |
| Färg | Rödaktigt brun till gul. Blå, violett, grå |
| Förekomstsätt | Tabellär, kilformade kristaller |
| Kristallstruktur | Trikliniskt |
| Spaltning | God på {100} |
| Brott | Conchoidalt |
| Hårdhet (Mohs) | 6,0 – 7,5 |
| Glans | Glasaktig |
| Refraktion | nα = 1,672-1,693 nβ = 1,677-1,701 nγ = 1,681-1,704 |
| Ljusbrytning | Biaxial (-) |
| Dubbelbrytning | δ = 0,011 |
| Pleokroism | Stark |
| Transparens | Genomskinlig till opak |
| Streckfärg | Vit |
| Specifik vikt | 3,18 - 3,37 |
| Referenser | [1][2] |
Axinit är ett brunt till brun-violett eller rödbrunt mineral med den kemiska sammansättningen (Ca,Fe,Mn)3Al2BO3Si4O12OH eller Ca2(Fe,Mn)Al2BSi4O15(OH) (kalcium-aluminium-bor-silikat). Axinit är pyro- och piezoelektriskt.
Axinitgruppen omfattar:
- Axinit-(Fe) eller ferroaxinit, Ca2Fe2+Al2BOSi4O15(OH) järnrik, kryddnejlikabrun, brun, plommonblå, pärlgrå[3]
- Axinit-(Mg) eller magnesioaxinit, Ca2MgAl2BOSi4O15(OH) magnesiumrik, ljusblå till ljusviolett; ljusbrun till ljusrosa[4]
- Axinit-(Mn) eller manganaxinit, Ca2Mn2+Al2BOSi4O15(OH) manganrik, honungsgul, kryddnejlikabrun, brun till blå[5]
- Tinzenit (CaFe2+Mn2+)3Al2BOSi4O15(OH) järn – mangan intermediate, gul, brungul-grön[6]
Egenskaper
Axinit hör till det triklina kristallsystemet; spaltningen är god; brottet konkoit (snäckformat); hårdhet 6,5–7; densitet 3,26–3,41. Strecket är vitt; glansen glasig. Brytningsindex 1,68–1,723.
Förekomst
Förekomster av axinit, som är en halvädelsten, finns i Dauphiné, Cornwall, Sachsen, Harz, Sverige och vid Kongsberg i Norge samt på olika ställen i Amerika.[7]
Användning
Axinit används ibland som en ädelsten.[8]
Bildgalleri
(c) Rob Lavinsky, iRocks.com – CC-BY-SA-3.0Kryddnejlikabruna axinitkristaller till 2,3 cm placerade ovanpå matrisen från West Bor-gropen i Dalnegorsk, Ryssland
(c) Rob Lavinsky, iRocks.com – CC-BY-SA-3.0Kloritiserade bladade kristaller av axinit som bildas på adularia från de schweiziska alperna
(c) Rob Lavinsky, iRocks.com – CC-BY-SA-3.0Tinzenit på kalcit, 4,5 × 3,5 × 3 cm. Wessels gruva, Kalahari manganfält, Norra Kapprovinsen, Sydafrika
(c) Rob Lavinsky, iRocks.com – CC-BY-SA-3.0Manganaxinit (Axinit-(Mn)), med skarpa böjda kristaller till 4 cm. West Bor Pit vid Dalnegorsk, Ryssland
Se även
- Kalciummineral
- Järnmineral
- Manganmineral
- Aluminiummineral
- Silikatmineral
- Lista över mineral
Referenser
- Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, Axinite, 10 januari 2024..
Noter
- ^ Axinite Arkiverad 19 november 2008 hämtat från the Wayback Machine. Arkiverad November 19, 2008. Mineral Galleries
- ^ Axinite. Mindat
- ^ Handbook of Mineralogy: Ferroaxinite
- ^ Handbook of Mineralogy: Magnesioaxinite
- ^ Handbook of Mineralogy: Manganaxinite
- ^ Handbook of Mineralogy: Tinzenite
- ^ Meyers varulexikon, Forum, 1952
- ^ Tables of Gemstone Identification By Roger Dedeyne, Ivo Quintens p.147
Externa länkar
Wikimedia Commons har media som rör Axinit.
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Media som används på denna webbplats
Axinite-60191.jpg
(c) Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
Axinite
(c) Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
Axinite
- Locality: Piz Vallatscha, Medel Valley, Grischun (Grisons; Graubünden), Switzerland (Locality at mindat.org)
- This is a highly aesthetic and amazingly beautiful display specimen from this famous part of the Swiss Alps. This piece is comprised of a pair of stunning, deep green, "chloritized" bladed crystals of Axinite forming a "wing like" shape flaring off a plate of Adularia. This piece is one of the most visual Axinite specimens you could ask for in this size range. Please note that the Axinite crystals are contacted on the reverse side of the specimen with little but it is truly not that distracting. Based upon the label, I would guess that this piece is at least 60 years old. These specimens are impossible to find in todays market, they simply are too few and far between to pass up. A great overall Alpine specimen ! 4.0 x 3.8 x 3.2cm
Tinzenite-Calcite-172430.jpg
(c) Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
Tinzenite, Calcite
(c) Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
Tinzenite, Calcite
- Locality: Wessels Mine (Wessel's Mine), Hotazel, Kalahari manganese fields, Northern Cape Province, South Africa (Locality at mindat.org)
- Size: 4.5 x 3.5 x 3 cm.
- Charlie says this is by 2 orders of magnitude the best of species, and I believe him. Even more surprising is the locality, as I’d never heard of tinzenite from South Africa before. These crystals have the color of the best serandite and lustre like glass. They reach 1.5 cm in size. Overall, it’s an extraordinarily beautiful specimen that is also of mineralogical significance. Ex. Charlie Key.
Axinite-64246.jpg
(c) Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
Axinite
(c) Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
Axinite
- Locality: West Bor Pit, Dal'negorsk B deposit, Dal'negorsk (Dalnegorsk; Tetyukhe; Tjetjuche; Tetjuche), Primorskiy Kray, Far-Eastern Region, Russia (Locality at mindat.org)
- Size: 5.2 x 4.7 x 4.0 cm.
- Very gemmy, all pristine, clove-brown axinite crystals to 2.3 cm set atop matrix from the West Bor Pit at Dalnegorsk, Russia.
Axinite-Mn - Canta, Lima, Peru.jpg
Författare/Upphovsman: Ivar Leidus, Licens: CC BY-SA 4.0
Translucent sharp crystals of manganaxinite to 2.5 cm in size with some greenish crystals of epidote (4.7 × 3.0 × 3.0 cm). Found from Canta, Lima, Peru
Författare/Upphovsman: Ivar Leidus, Licens: CC BY-SA 4.0
Translucent sharp crystals of manganaxinite to 2.5 cm in size with some greenish crystals of epidote (4.7 × 3.0 × 3.0 cm). Found from Canta, Lima, Peru
-239862.jpg)
Axinite-(Mn)-239862.jpg
(c) Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
Axinite-(Mn)
(c) Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
Axinite-(Mn)
- Locality: Bor Pit (Boron Pit; Bor Quarry), Dal'negorsk B deposit, Dal'negorsk (Dalnegorsk; Tetyukhe; Tjetjuche; Tetjuche), Primorskiy Kray, Far-Eastern Region, Russia (Locality at mindat.org)
- Size: 22.0 x 13.1 x 7.2 cm.
- This is a very rare, large plate of manganaxinite from the mines at Dal’negorsk, with sharp curving crystals to 4 cm in height splaying out from the matrix in all directions. It is, despite its size, nearly pristine. Note that this is not to be confused with the far more common axinites from Puiva in the Ural Mountains. You can note it by the distinct crystal style of robust, curving crystals that are fatter and more opaque than Puiva material, much like the old Japanese material in fact. These specimens were found in the late 1990s. Weighs nearly 2 kilograms.