Gaspeite
- IMA 1965-029
Gaspéit is a rarely occurring mineral from the mineral class of " carbonates ( and relatives ) ." It crystallizes in the trigonal crystal system with the chemical composition Ni [ CO3 ] and developed only small, diamond-shaped crystals to about 0.5 mm in length nierigen to massive mineral aggregates of light green, grass green to olive green color with yellow-green stroke color.
Gaspéit forms a complete mixed batch with magnesite (Mg [ CO3 ] ).
Special Features
Gaspéit is insoluble in water and very slightly soluble in nitric acid and hydrochloric acid.
Etymology and history
Gaspéit was first discovered at Mont -Albert described in Canadian County La Haute- Gaspésie on the Gaspé Peninsula and 1966 by Donald W. Kohl and John Landon Rodda who named the mineral after its type locality.
Classification
In the now outdated but still in use 8th edition of the mineral classification by Strunz the siderite " water outdoors carbonates without foreign anions " belonged to the common mineral class of " carbonates, nitrates and borates " and then to the Department of where he together with calcite, magnesite, Otavit, rhodochrosite, siderite, smithsonite, and vaterite Sphärocobaltit the " Calcitgruppe " was formed.
The 9th edition used since 2001 and valid by the International Mineralogical Association (IMA ) of the Strunz'schen Mineral classification assigns the siderite in the class of " carbonates and nitrates " ( here, the borates form a separate class) and then in the Department of " carbonates without further anions, without H2O ". This division, however, is further subdivided according to the nature of the cations involved, so that the mineral is found according to its composition in the subsection " alkaline-earth (and other M2 ) carbonates ", where it together with calcite, magnesite, Otavit, rhodochrosite, siderite, Smithsonite and Sphärocobaltit the " Calcitgruppe " with the system no. 5.AB.05 forms.
The classification of minerals according to Dana assigns the siderite as the outdated 8th edition of the Strunz'schen systematics in the common class of " carbonates, nitrates and borates " and there in the department of " water clear carbonates ". Here he is with calcite, magnesite, siderite, Sphärocobaltit, Smithsonite, Rhodochrosite Otavit and in the " Calcitgruppe ( Trigonal: R- 3c)" with the system no. 14:01:01 within the sub-division of " water clear CO3 carbonates with a simple formula A " to find.
Education and Locations
Gaspéite forms as a rare secondary mineral in nickel sulfide-bearing veins in metamorphic converted siliceous dolomite, possibly as a conversion product in nickel-rich meteorites. Accompanying minerals include Annabergite, antigorite, bunsenite, chrysotile, dolomite, Gersdorffite, Glaukosphaerit, Heazlewoodite, Jamborite, Liebenbergit, magnesite, Mcguinnessit, Millerite, Nickeline, Nimit, Pecorait, Polydymit, siderite, spinel, and Trevorit Violarit.
Worldwide, Gaspéit so far (as of 2011) are detected in about 20 localities, including, inter alia at several locations in Tasmania and Western Australia in Australia; on Duboštica at Vareš in Bosnia and Herzegovina; at Richelsdorf in Germany; in the " Km -3 Mine" at Lavrion ( Laurion ) in the Greek region of Attica; in the " Monteponi Mine" with Iglesias on the Italian island of Sardinia; in the " Nakauri Mine" at Shinshiro on the Japanese island of Honshu; in the " Kempirsai Cr deposit" in Aktobe in Kazakhstan; on Mabilikewe ( Limpopo ) and Bon Accord ( Mpumalanga) South Africa; in the " Eugenia Mine" at Bellmunt del Priorat in the Spanish province of Tarragona and the " Damba deposit" in Gweru in Zimbabwe.
Crystal structure
Gaspéit trigonal crystallized in the space group ( Raumgruppen-Nr. 167) with the lattice parameters a = 4.61 Å and c = 14.74 Å and 6 formula units per unit cell.