Bottinoite

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Bottinoite
Bottinoite-402628.jpg
Bottinoite from the Dörnberg Mine, Ramsbeck , Meschede, Sauerland
General and classification
other names

IMA 1991-029

chemical formula Ni (H 2 O) 6 [Sb (OH) 6 ] 2
Mineral class
(and possibly department) 		Oxides and hydroxides
System no. to Strunz
and to Dana 		4.FH.05 ( 8th edition : IV / F.04)
03/06/09/01
Crystallographic Data
Crystal system trigonal
Crystal class ; symbol trigonal-pyramidal 3
Space group P 3
Lattice parameters a  = 16.03  Å ; c  = 9.79 Å Please complete the source as an individual reference!
Formula units Z  = 6 Please complete the source as an individual reference!
Physical Properties
Mohs hardness 3 (VHN 10 105 kg / mm 2 )
Density (g / cm 3 ) measured: 2.83; calculated: 2.81
Cleavage Please complete!
Break ; Tenacity shell-like
colour light blue to bluish green
Line color very light blue
transparency transparent
shine Glass gloss
Crystal optics
Refractive indices n ω  = 1.600
n ε  = 1.605
Birefringence δ = 0.005
Optical character uniaxial positive

Bottinoite is a mineral from the mineral class of " oxides and hydroxides ". It crystallizes in the trigonal crystal system with the chemical composition Ni (H 2 O) 6 [Sb (OH) 6 ] 2 and develops mostly rosette-like aggregates with a diameter of about 2.5 mm from transparent, tabular crystals of light blue to blue-green color at very light blue line color .


Etymology and history

As early as 1987, an unusual, blue-green mineral was discovered in the “Bottino Mine” near the Italian municipality of Stazzema and given to one of the research groups around Paola Bonazzi for analysis. Bonazzi and the other members of the group, Silvio Menchetti, Andrea Caneschi and Stefano Magnanelli, were able to determine that this mineral was a new and previously unknown, water-containing nickel - antimony- hydroxide and submitted their test results in 1991 for examination by the International Mineralogical Association (IMA ) a (registration number: IMA 1991-029 ). This recognized the mineral as independent in the same year. The name, which indicates its type locality , was also accepted.

classification

In the now outdated, but still in use 8th edition of the mineral classification according to Strunz , the bottinoite belonged to the mineral class of "oxides and hydroxides" and to the department of "hydroxides and oxidic hydrates", where it formed an independent group with brandholzite and jamborite .

The 9th edition of Strunz's mineral systematics , which has been in effect since 2001 and is used by the IMA, also assigns bottinoite to the class of "oxides and hydroxides", but in the separate division of "hydroxides (without V or U)". This section is also more precisely subdivided according to the presence or absence of crystal water or hydroxide ions (OH) and the crystal structure, so that the mineral according to its composition and structure is classified in the subsection “Hydroxides with H 2 O ± (OH); isolated octahedron ”can be found, where it only forms the unnamed group 4.FH.05 together with brandholzite .

The systematics of minerals according to Dana also assigns bottinoite to the class of "oxides and hydroxides" and there into the department of "hydroxides and hydroxides containing oxides". Here it can be found together with brandholzite in the unnamed group 06.03.09 within the sub-section " Hydroxides and hydroxides containing (OH) 3− or (OH) 6 groups ".

Education and Locations

Bottinoite usually forms on or ingrown in ullmannite in weathered hydrothermal , metallic deposits . Other accompanying minerals include calcite , chalcopyrite , galena , sphalerite , phlogopite , pyrite , quartz and siderite .

In addition to its type locality "Bottino Mine" near Stazzema, Bottinoit could also be found in Italy near Fornovolasco in the municipality of Vergemoli (both located within the Apuan Alps ). In Germany, the mineral was discovered in the Sauerland (Dörnberg Mine near Ramsbeck ) and in the Siegerland (Brüderbund Mine, Adler Mine, Jakobskrone Mine and Concordia Mine).

Other localities are Céret in France, Lanzuela ( Province of Teruel ) in Spain as well as in the Pennines (Nenthead, England) and at several localities in Ceredigion (Wales) in the United Kingdom (Great Britain).

Crystal structure

Bottinoite crystallizes isotypically with brandholzite in the space group P 3 with the lattice parameters a  = 16.03  Å and c  = 9.79 Å as well as 6 formula units per unit cell .

Within the crystal structure , insular octahedra made of Ni (H 2 O) 6 and octahedra made of Sb 5+ (OH) 6 are connected to one another via shared hydrogen (HH) electrons .

See also

Individual evidence

  1. ↑ Webmineral - Brandholzite (English)
  2. ↑ a b c Bottinoite at mindat.org (engl.)
  3. ^ Hugo Strunz , Ernest H. Nickel: Strunz Mineralogical Tables . 9th edition. E. Schweizerbart'sche Verlagbuchhandlung (Nägele and Obermiller), Stuttgart 2001, ISBN 3-510-65188-X , p. 242 .

Web links

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