Ganophyllite is a phyllosilicate mineral. It was named by Axel Hamberg in 1890 from the Greek words for leaf (φύλλον) and luster (γανωμα); the latter one was chosen due to the lustrous cleavages. The mineral was approved by the IMA in 1959, and it is a grandfathered mineral, meaning its name is still believed to refer to an existing species until this day.[2] Tamaite is the calcium analogue, while eggletonite is the natrium analogue of said mineral.[3]
Ganophyllite is a member of the ganophyllite group, among with eggletonite and tamaite, and it is the potassium variety of eggletonite. Common impurities of the mineral include lead, iron, calcium, barium, and zinc. The zinc impurities can be explained with the fact the mineral usually grows in zinc-manganese mines.[2] The formula of ganophyllite includes potassium (K), while eggletonite includes sodium (Na) and tamaite includes calcium (Ca). It has a barely detectable potassium radioactivity and a barely detectable 1.8% radiation measured by GRapi (Gamma Ray American Petroleum Institute Units). It mostly consists of oxygen (47.02%), manganese (21.77%) and silicon (16.69%), but otherwise contains aluminium (5.88%), potassium (3.87%), which gives ganophyllite its radioactive attributes, magnesium (2.41%), hydrogen (1.6%) and sodium (0.76%). Ganophyllite is pleochroic, which means the mineral's color seems as though it changes depending on the axis it is inspected on: on the X axis, it is seen in a pale yellow-brown color, and on the Y and Z axis, it can be seen as a dark yellow-brown gem. The mineral has a foliated crystal habit - it forms platy, thin sheets that part, and are layered on top of one another.[4]
Distributionedit
Ganophyllite occurs in metamorphosed manganese deposits, especially in zinc-manganese ones. It is a type locality of the Harstigen mine in Sweden, although the first specimen was found at the Nant mine in Wales, however, it can also be found in the Benallt mine as well.[3] Other places where it has been found include Molinello and Gambatesa mines in Italy, Maple-Hovey deposits in Franklin, New Jersey and at Mont Saint-Hilaire in Canada. Asian mines include the Kumahata mine, the Noda-Tamagawa mine, the Ananai mine, and the Osu and Yonoyama mines, all in Japan. Ganophyllite can be found at the Broken hill in Australia as well.[5]
Associated mineralsedit
Ganophyllite has a lot of minerals associated with it, although most of it is mine specific. In each mine, the minerals associated with ganophyllite may vary.
ganophyllite, phyllosilicate, mineral, named, axel, hamberg, 1890, from, greek, words, leaf, φύλλον, luster, γανωμα, latter, chosen, lustrous, cleavages, mineral, approved, 1959, grandfathered, mineral, meaning, name, still, believed, refer, existing, species,. Ganophyllite is a phyllosilicate mineral It was named by Axel Hamberg in 1890 from the Greek words for leaf fyllon and luster ganwma the latter one was chosen due to the lustrous cleavages The mineral was approved by the IMA in 1959 and it is a grandfathered mineral meaning its name is still believed to refer to an existing species until this day 2 Tamaite is the calcium analogue while eggletonite is the natrium analogue of said mineral 3 GanophylliteGeneralCategoryMineralFormula repeating unit K Na Ca 2Mn8 Si Al 12 O OH 32 8H2OIMA symbolGnp 1 Strunz classification09 EG 30Dana classification74 01 02 01Crystal systemMonoclinicCrystal classPrismatic 2 m Space groupA2 aUnit cell22 545 01IdentificationFormula mass1 514 2ColorBrownish yellow to cinnamon brownCrystal habitFoliated micaceousCleavagePerfect on FractureBrittleMohs scale hardness4 4 5LusterVitreousStreakBrownish yellowDiaphaneityTransparent to transculentSpecific gravity2 84Density2 84Optical propertiesBiaxial Refractive indexna 1 537 nb 1 611 ng 1 613Birefringence0 076PleochroismX Pale yellow brown Y Z Dark yellow brownDispersionWeakUltraviolet fluorescenceNoneCommon impuritiesFe Zn Pb Ca BaOther characteristicsRadioactive 3 87 K Contents 1 Properties 2 Distribution 3 Associated minerals 4 ReferencesProperties editGanophyllite is a member of the ganophyllite group among with eggletonite and tamaite and it is the potassium variety of eggletonite Common impurities of the mineral include lead iron calcium barium and zinc The zinc impurities can be explained with the fact the mineral usually grows in zinc manganese mines 2 The formula of ganophyllite includes potassium K while eggletonite includes sodium Na and tamaite includes calcium Ca It has a barely detectable potassium radioactivity and a barely detectable 1 8 radiation measured by GRapi Gamma Ray American Petroleum Institute Units It mostly consists of oxygen 47 02 manganese 21 77 and silicon 16 69 but otherwise contains aluminium 5 88 potassium 3 87 which gives ganophyllite its radioactive attributes magnesium 2 41 hydrogen 1 6 and sodium 0 76 Ganophyllite is pleochroic which means the mineral s color seems as though it changes depending on the axis it is inspected on on the X axis it is seen in a pale yellow brown color and on the Y and Z axis it can be seen as a dark yellow brown gem The mineral has a foliated crystal habit it forms platy thin sheets that part and are layered on top of one another 4 Distribution editGanophyllite occurs in metamorphosed manganese deposits especially in zinc manganese ones It is a type locality of the Harstigen mine in Sweden although the first specimen was found at the Nant mine in Wales however it can also be found in the Benallt mine as well 3 Other places where it has been found include Molinello and Gambatesa mines in Italy Maple Hovey deposits in Franklin New Jersey and at Mont Saint Hilaire in Canada Asian mines include the Kumahata mine the Noda Tamagawa mine the Ananai mine and the Osu and Yonoyama mines all in Japan Ganophyllite can be found at the Broken hill in Australia as well 5 Associated minerals editGanophyllite has a lot of minerals associated with it although most of it is mine specific In each mine the minerals associated with ganophyllite may vary In the Harstigen mine the associated minerals are the followings pyrophanite caryopilite calcite garnet rhodonite barite lead and manganoan biotite Ganophyllites from the Molinello mine have the following associated minerals caryopilite and parsettensite The following associated minerals can occur with specimens from Franklin axinite rhodonite datolite willemite bustamite charlesite clinohedrite and roeblingite 5 References edit Warr L N 2021 IMA CNMNC approved mineral symbols Mineralogical Magazine 85 3 291 320 Bibcode 2021MinM 85 291W doi 10 1180 mgm 2021 43 S2CID 235729616 a b Ganophyllite www mindat org Retrieved 2021 06 22 a b Mineral Database Mineralogy of Wales National Museum Wales Retrieved 2021 10 18 Ganophyllite Mineral Data webmineral com Retrieved 22 January 2021 a b Ganophyllite PDF Handbook of Mineralogy Retrieved from https en wikipedia org w index php title Ganophyllite amp oldid 1169588308, wikipedia, wiki, book, books, library,
