Gaspéit
| Gaspéit | |
|---|---|
 |
|
| General and classification | |
| other names |
IMA 1965-029 |
| chemical formula | Ni [CO 3 ] |
|
Mineral class (and possibly department) |
Carbonates (and relatives) |
|
System no. to Strunz and to Dana |
5.AB.05 ( 8th edition : V / B.02) 01/14/01/08 |
| Crystallographic Data | |
| Crystal system | trigonal |
| Crystal class ; symbol | ditrigonal-scalenohedral; 3 2 / m |
| Space group | R 3 c (No. 167) |
| Lattice parameters | a = 4.61 Å ; c = 14.74 Å |
| Formula units | Z = 6 |
| Physical Properties | |
| Mohs hardness | 4.5 to 5 |
| Density (g / cm 3 ) | measured: 3.71 (1); calculated: 3.748 |
| Cleavage | good after {10 1 1} |
| Break ; Tenacity | uneven |
| colour | light green, grass green, olive green |
| Line color | yellow-green |
| transparency | translucent |
| shine | Glass gloss, matt |
| Crystal optics | |
| Refractive indices |
n ω = 1.830 n ε = 1.610 |
| Birefringence | δ = 0.220 |
| Optical character | uniaxial negative |
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 [CO 3 ] and develops only small, rhombic crystals up to about 0.5 mm in length in kidney to massive mineral aggregates of light green, grass green to olive green in color with yellowish green streak color .
Gaspéit forms a seamless mixed series with magnesite (Mg [CO 3 ]).
Etymology and history
Gaspéit was first discovered near Mont-Albert in the Canadian county of La Haute-Gaspésie on the Gaspésie peninsula and described in 1966 by Donald W. Kohls 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In the now outdated, but still in use 8th edition of the mineral classification according to Strunz , the Gaspéit belonged to the common mineral class of "carbonates, nitrates and borates " and there to the department of "anhydrous carbonates without foreign anions ", where together with calcite , magnesite , Otavite , rhodochrosite , siderite , smithsonite , spherocobaltite and vaterite formed the "calcite group".
The 9th edition of Strunz's mineral systematics , which has been in effect since 2001 and is used by the International Mineralogical Association (IMA), assigns the Gaspéit to the class of “carbonates and nitrates” (the borates form a separate class here) and there to the “ Carbonates without additional anions; without H 2 O “. However, this section is further subdivided according to the type of cations involved , so that the mineral can be found according to its composition in the sub-section "alkaline earth (and other M 2+ ) carbonates", where it is found together with calcite, magnesite, otavite, rhodochrosite , Siderite, smithsonite and spherocobaltite the "calcite group" with the system no. 5.AB.05 forms.
The systematics of minerals according to Dana assigns the Gaspéit like the outdated 8th edition of Strunz's systematics to the common class of “carbonates, nitrates and borates” and there to the department of “anhydrous carbonates”. Here it is together with calcite, magnesite, siderite, spherocobaltite, smithsonite, otavite and rhodochrosite in the "Calcite group (Trigonal: R-3c)" with the system no. 01/14/01 to be found in the subsection of " Anhydrous carbonates with simple formula A + CO 3 ".
Crystal structure
Gaspéit crystallizes trigonally in the space group R 3 c (space group no. 167) with the lattice parameters a = 4.61 Å and c = 14.74 Å as well as 6 formula units per unit cell .
properties
Gaspéit is insoluble in water and only very slightly soluble in nitric acid and hydrochloric acid .
Education and Locations
Gaspéit forms as a rare secondary mineral in veins containing nickel sulphide in metamorphically converted silicic acid-containing dolomite rock , possibly also as a conversion product in nickel-rich meteorites. Begleitminerale include Annabergit , antigorite , bunsenite , chrysotile , dolomite , Gersdorffit , Glaukosphärit , Heazlewoodite , Jamborit , Liebenbergit , magnesite , Mcguinnessit , Millerit , Nickelin , Nimit , Pecorait , Polydymit , siderite , spinel , Trevorit and Violarite .
So far (as of 2011) Gaspéit has been detected at around 20 sites worldwide, including several locations in Tasmania and in Western Australia in Australia; on Duboštica near Vareš in Bosnia and Herzegovina; near Richelsdorf in Germany; in the "Km-3 Mine" near Lavrio (Laurion) in the Greek region of Attica; in the “Monteponi Mine” near Iglesias on the Italian island of Sardinia; in the “Nakauri Mine” near Shinshiro on the Japanese island of Honshū; in the "Kempirsai Cr deposit" near Aqtöbe in Kazakhstan; at Mabilikewe ( Limpopo ) and at Bon Accord ( Mpumalanga ) in South Africa; in the “Eugenia Mine” near Bellmunt del Priorat in the Spanish province of Tarragona and in the “Damba deposit” near Gweru in Zimbabwe.
See also
literature
- DW Kohls, JL Rodda: Gaspeite, (Ni, Mg, Fe) (CO 3 ), A new carbonate from the Gaspe Peninsula, Quebec . In: The American Mineralogist . tape 51 , 1966, pp. 677–684 (English, minsocam.org [PDF; 424 kB ; accessed on December 21, 2018]).
Web links
- Mineral Atlas: Gaspéit (Wiki)
- David Barthelmy: Gaspeite Mineral Data. In: webmineral.com. Retrieved December 21, 2018 .
Individual evidence
- ^ A b c Hugo Strunz , Ernest H. Nickel : Strunz Mineralogical Tables. Chemical-structural Mineral Classification System . 9th edition. E. Schweizerbart'sche Verlagbuchhandlung (Nägele and Obermiller), Stuttgart 2001, ISBN 3-510-65188-X , p. 286 (English).
- ↑ a b c Gaspéite . In: John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols (Eds.): Handbook of Mineralogy, Mineralogical Society of America . 2001 (English, handbookofmineralogy.org [PDF; 65 kB ; accessed on December 21, 2018]).
- ↑ a b c Gaspéite. In: mindat.org. Hudson Institute of Mineralogy, accessed December 21, 2018 .
- ↑ Palmerton Mayor: John Landon Rodda. In: articles.mcall.com. The Morning Call, April 10, 2000, accessed December 21, 2018 .
- ↑ Find location list for Gaspéit at the Mineralienatlas and at Mindat