Hazenite
- IMA 2007-061
Hazenit is a very rarely occurring mineral from the mineral class of " phosphates, arsenates and vanadates ." It crystallizes in the orthorhombic crystal system with the chemical composition KNaMg2 [ PO4 ] 2.14 H2O, and is therefore a hydrated potassium sodium magnesium phosphate.
Hazenit was found in the form of radialstrahlig grown colorless and transparent crystals to about 0.06 mm × 0.12 mm × 0.40 mm in size and found tafeligem to prismatic habit.
Special Features
Hazenit dissolves at room temperature in 10 percent hydrochloric acid.
Etymology and history
Was first discovered Hazenit of Hexiong Yang ( University of Arizona ) on the south shore of Mono Lake in California, who also analyzed the mineral, described and claimed in the U.S. scientist Robert M. Hazen (1948 - ) named.
End of 2007, Yang filed a results of its research and the application for recognition as an independent mineral in the International Mineralogical Association (IMA ), which won the register number IMA2007 -061. Recognized mineral and the name Hazenit on 28 February 2008.
Classification
In the now outdated but still in use 8th edition of the mineral classification by Strunz the Hazenit belonged to the department of " water -containing phosphates without foreign anions ", where he was the unnamed group VII/C.22 together with Catalanoit and Dorfmanit.
The 9th edition used since 2001 and valid by the International Mineralogical Association (IMA ) of the Strunz'schen Mineral classification assigns the Hazenit also in the department of " Phosphates without additional anions, with H2O" one. However, this is further divided according to the relative size of the involved cations and the molar ratio of phosphate, vanadate or arsenate complex ( RO 4 ) to the crystal water ( H2O), so that the mineral according to its composition in the subsection "With large and medium cations, RO 4: H 2 O <1 " is to find where it together with struvite and struvite - (K ) " 1 Struvitgruppe "with the system no. 8.CH.40 forms.
The classification of minerals according to Dana assigns the Hazenit in the class of " phosphates, arsenates and vanadates " and there in the department of " water -containing phosphates, etc. " field. Here it is also composed of struvite and struvite - (K ) in the " Struvitgruppe " with the system no. 40.01.01 found within the subdivision " water containing phosphates, etc., with A2 B2 ( XO4 ) • x (H2O) ".
Education and Locations
Is Hazenit by microorganisms in Mono Lake ( an alkaline salt lake in Mono County, California ) is formed and is found in the dried or decomposed algae on a substrate of porous calcium carbonate in the form of the minerals calcite and aragonite.
So far (as of 2012) could Hazenit only at its type locality Mono Lake (California ) could be detected.
Crystal structure
Hazenit crystallizes in the orthorhombic space group Pnma with the lattice parameters a = 25.1754 Å; b = 6.9316 Å; c = 11.2189 Å and four formula units per unit cell.