Danbait

Danbait
	Danbait crystal from Mansfeld , Eisleben, Saxony-Anhalt, Germany
General and classification
other names	IMA 1981-041
chemical formula	CuZn 2
Mineral class; (and possibly department)	Elements - metals and intermetallic alloys
System no. to Strunz ; and to Dana	1.AB.10b ( 8th edition : I / A.04) ; 01.01.06.01
Crystallographic Data
Crystal system	cubic
Crystal class ; symbol	not defined
Lattice parameters	a = 7.7615 Å
Formula units	Z = 12
Physical Properties
Mohs hardness	4.2 (VHN 20 = 234-288)
Density (g / cm 3 )	calculated: 7.36
Cleavage	is missing
colour	silver-white to gray-white
Line color	Please complete
transparency	opaque
shine	Metallic luster

Danbaite is a very rare mineral from the mineral class of the elements, more precisely metals and intermetallic compounds. It crystallizes in the cubic crystal system with the chemical composition CuZn ₂ and forms grape-shaped and spherical aggregates from 0.05 to 0.2 mm in size as well as edges around chromium in copper - nickel ores.

Etymology and history

Danbait was first discovered in 1983 by Yue Shuqin, Wang Wenying, Liu Jinding, Sun Shuqiong and Chen Dianfen in the type locality Rongzhag (Chinese: Danba ) in the Garzê Autonomous District of the Tibetans in the Chinese province of Sichuan . It is named after this too.

classification

Already in the outdated, but partly still in use 8th edition of the mineral classification according to Strunz , the danbait belonged to the mineral class of the "elements" and there to the department of "metals and intermetallic alloys (without semimetals)", where together with cadmium , brass , tongxinite , Zhanghengit and zinc formed the unnamed group I / A.04 .

The 9th edition of Strunz's mineral systematics , which has been in effect since 2001 and is used by the International Mineralogical Association (IMA), also classifies the danbait in the department of “Metals and Intermetallic Compounds”. However, this is further subdivided according to the predominant metals in the compound, which have been divided into metal families according to their related properties. According to its composition, danbait can be found in the sub-section "zinc-brass family", where it only forms the unnamed group 1.AB.10b together with tongxinite .

The systematics of minerals according to Dana , which is mainly used in the English-speaking world , assigns the danbait to the class and there in the "elements" department. Here it can be found in the unnamed group 01.01.06 within the sub-section "Elements: Metallic elements other than the platinum group".

Education and Locations

Danbait formed in a severely aged inclusion of a platinum -bearing copper-zinc deposit in ultramafic rocks . It is associated with chromium, pyrrhotite , pentlandite , chalcopyrite , violarite , cubanite , bornite , sphalerite , galena , linnite , magnetite , testibiopalladite , sudburyite , sperrylite , omeiite and gold .

In addition to its type locality Rongzhag ( Danba ) in China, the mineral is so far only known from Mansfeld near Lutherstadt Eisleben in Saxony-Anhalt, Germany (as of 2018).

Crystal structure

Danbaite crystallizes in the cubic crystal system with the lattice parameter a = 7.7615 Å , as well as twelve formula units per unit cell . The exact space group is not known.

literature

Danbaite . In: John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols (Eds.): Handbook of Mineralogy, Mineralogical Society of America . 2001 ( handbookofmineralogy.org [PDF; 60 kB ; accessed on May 9, 2018]).
Yue Shuqin, Wang Wenying, Liu Jinding, Sun Shuqiong, Chen Dianfen: A study on danbaite . In: Kexue Tongbao . tape 22 , 1983, pp. 1383-1386 (Chinese).
Yue Shuqin, Wang Wenying, Liu Jinding, Sun Shuqiong, Chen Dianfen: A study on danbaite from a copper-nickel sulfide deposit, southwest China . In: Kexue Tongbao . tape 29 , no. 5 , 1984, pp. 646–650 (English, rruff.info [PDF; 262 kB ; accessed on May 9, 2018]).
Pete J. Dunn, George Y. Chao, Joel D. Grice, James A. Ferraiolo, Michael Fleischer, Adolf Pabst, Janet A. Zilczer: New Mineral Names . In: American Mineralogist . tape 65 , 1984, pp. 565–569 (English, minsocam.org [PDF; 642 kB ; accessed on May 9, 2018]).

Web links

Commons : Danbaite - collection of images, videos and audio files

Mineral Atlas: Danbait
Mindat - Danbaite (English)

Individual evidence

↑ Yue Shuqin, Wang Wenying, Liu Jinding, Sun Shuqiong, Chen Dianfen: A study on danbaite from a copper-nickel sulfide deposit, southwest China . In: Kexue Tongbao . tape 29 , no. 5 , 1984, pp. 1383–1386 ( rruff.info [PDF; 262 kB ; accessed on May 9, 2018]).
↑ ^a ^b ^c Danbaite . In: John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols (Eds.): Handbook of Mineralogy, Mineralogical Society of America . 2001 ( handbookofmineralogy.org [PDF; 60 kB ; accessed on May 9, 2018]).
↑ Find location list for Danbait at the Mineralienatlas and at Mindat

[Shuqin-et-al-1984-1] Yue Shuqin, Wang Wenying, Liu Jinding, Sun Shuqiong, Chen Dianfen: A study on danbaite from a copper-nickel sulfide deposit, southwest China . In: Kexue Tongbao . tape 29 , no. 5 , 1984, pp. 1383–1386 ( rruff.info [PDF; 262 kB ; accessed on May 9, 2018]).

[Datenblatt-2] Danbaite . In: John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols (Eds.): Handbook of Mineralogy, Mineralogical Society of America . 2001 ( handbookofmineralogy.org [PDF; 60 kB ; accessed on May 9, 2018]).

[Fundorte-3] Find location list for Danbait at the Mineralienatlas and at Mindat