Natalyite

from Wikipedia, the free encyclopedia
Natalyite
Natalyite.jpg
Dark green natalyite from the uranium-vanadium deposit Srednjaja Padma,
Republic of Karelia , Russia
General and classification
other names

IMA 1984-053

chemical formula NaV 3+ Si 2 O 6
Mineral class
(and possibly department) 		Silicates and Germanates
System no. to Strunz
and to Dana 		9.DA.25 ( 8th edition : 8 / F.01-160)
65.1.3c.5
Crystallographic Data
Crystal system monoclinic
Crystal class ; symbol monoclinic prismatic; 2 / m
Space group C 2 / c (No. 15)Template: room group / 15
Lattice parameters a  = 9.6385 (8), synthetic
a = 9.58 (1), natural  Å ; b  = 8.7443 (7), synthetic
b = 8.72 (1), natural Å; c  = 5.2976 (8), synthetic
c = 5.27 (1), natural Å
β  = 106.915 (9) °, synthetic
107.16 °, natural °
Formula units Z  = 4
Physical Properties
Mohs hardness 7th
Density (g / cm 3 ) 3.55 (calculated)
Cleavage {110}
Break ; Tenacity parallel (001)
colour light green, yellowish
Line color green
transparency not specified
shine Glass gloss
Crystal optics
Refractive indices n α  = 1.741 (2), natural mixed crystal
n β  = 1.763 (3), natural mixed crystal
n γ  = 1.763 (3), natural mixed crystal
Refractive index n  = not determined
Birefringence δ = 0.022
Optical character biaxial negative
Axis angle 2V = 8-12 °
Pleochroism strong: emerald green, green-yellow, yellow

The mineral natalyite is an extremely rare chain silicate from the pyroxene group with the idealized chemical composition NaVSi 2 O 6 .

Natalyite crystallizes with monoclinic symmetry and forms light green crystals, usually less than one millimeter in size. The prismatic to asbestos-like fibrous crystals stretched along the c-axis [001] show the prismatic surfaces {110} and the base surfaces {100} and {010} with a glass luster. Fibrous aggregates have a silky sheen .

So far (2019) natalyite has only been described at three sites. In the type locality , the marble -Steinbruch Perevalist in Slyudyanka on the southwestern end of Lake Baikal in Irkutsk Oblast , Russia , he appears in a chrome - and vanadium-rich diopside - quartz on -Fels.

Etymology and history

The Japanese working group around Haruo Ohashi from the “National Institute for Researches in Inorganic Material” (NIRIM) in Sakura (Chiba) , Japan, synthesized a Na-V-pyroxene in the late 1970s, but did not publish a structural study until 1994.

A natural Na-V pyroxene was discovered in 1985 by Soviet geoscientists in a marble quarry near the town of Slyudyanka on Lake Baikal. It was named after the geologist Natalja Wassiljewna Frolowa (Russian Наталья Васильевна Фролова , English Natalya Vasil'evna Frolova ), who died in 1960 .

classification

In the structural classification of the International Mineralogical Association (IMA), natalyite belongs together with jadeite , aegirine , cosmochlor , jervisite and namansilite to the sodium pyroxenes in the pyroxene group .

Already in the outdated, but partly still in use 8th edition of the mineral systematics according to Strunz , the natalyite belonged to the mineral class of "silicates and germanates" and there to the department of "chain silicates and band silicates (inosilicates)", where it together with aegirine, augite , diopside , Esseneit , Hedenbergit , Jadeit, Jervisit, Johannsenite , kanoite , clino-enstatite , Klinoferrosilit , Kosmochlor, Namansilit, omphacite , Petedunnit , pigeonite and spodumene the "subset of clinopyroxene" with the system number. VIII / F.01.

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 natalyite in the category of "chain and band silicates (inosilicates)". However, this is further subdivided according to the structure of the silicate chains, so that the mineral is classified in the sub-section “Chain and band silicates with 2-periodic single chains Si 2 O 6 ; Pyroxene family "can be found, where the" Na-Klinopyroxene "or" Jadeite group "with the system no. Can only be found together with aegirine, jadeite, jervisite, cosmochlor and namansilite. 9.DA.25 forms.

The systematics of minerals according to Dana , which is mainly used in the English-speaking world , assigns natalyite to the class of "silicates and Germanates" and there in the department of "chain silicate minerals". Here it is in the " C2 / c Klinopyroxene (Na-Klinopyroxene) " with the system no. 65.1.3c.5 can be found in the subsection “Chain silicates: Simple unbranched chains, W = 1 with chains P = 2”.

Chemism

Natalyite with the idealized composition [M2] Na [M1] V 3+ [T] Si 2 O 6 is the vanadium (V) analog of jadeite ( [M2] Na [M1] Al [T] Si 2 O 6 ), Aegirine ( [M2] Na [M1] Fe 3+ [T] Si 2 O 6 ), jervisite ( [M2] Na [M1] Sc 3+ [T] Si 2 O 6 ) and cosmochlor ( [M2] Na [M1 ] Cr 3+ [T] Si 2 O 6 ), where [M2], [M1] and [T] are the positions in the pyroxene structure.

Besides Burnettit Natalyit is the second vanadium pyroxene.

The composition of the natalyite is from the type locality

  • [M2] (Na 0.92 Ca 0.07 ) [M1] (V 3+ 0.54 Cr 3+ 0.36 Al 0.03 Mg 0.07 ) [T] Si 1.99 O 6 .

There is complete miscibility of natalyite with diopside and cosmochlor according to the exchange reactions

  • [M1] V 3+ = [M1] Cr 3+ ( cosmochlor )
  • [M2] Na + + [M1] V 3+ = [M2] Ca 2+ + [M1] Mg 2+ ( diopside )

as well as with aegirine, according to the exchange reaction

  • [M1] V 3+ = [M1] Fe 3+ (aegirine).

Crystal structure

Natalyite crystallizes with monoclinic symmetry in the space group C 2 / c (space group no. 15) with four formula units per unit cell . The lattice parameters of the synthetic end  link are a = 9.6385 (8)  Å , b  = 8.7443 (7) Å, c  = 5.2976 (8) Å and β = 106.915 (9) °. Template: room group / 15

The structure is that of clinopyroxene. Silicon (Si 4+ ) occupies the tetrahedral T position surrounded by four oxygen ions, sodium (Na + ) occupies the octahedral M2 position surrounded by six oxygen ions, and the octahedral M1 position is occupied by vanadium (V 3+ ).

Education and Locations

Natalyite is formed during the metamorphosis of vanadium-rich sediments , e.g. B. quartzites or uranium vanadium deposits .

Type locality is the marble quarry Perewal at the southwest end of Lake Baikal in Irkutsk Oblast , Russia. In the archaic , granulitfaziel overprinted sediments Natalyit occurs in chromium and vanadium-rich diopside - quartz -Fels together with Karelianit - eskolaite - mixed crystals , Cr-V-shells ( Goldmanit - Uwarowit ), Cr-V tourmaline , pyrite and apatite on .

The Perewal quarry has been extensively investigated for its Cr-V mineralization and the type locality of 11 minerals (2019), including the tourmalines oxy-vanadium-dravite , vanadium-oxy-chromium-dravite , oxy-chromium-dravite and chromo- Alumino-povondrait , the amphibole vanadiopargasite , the thiospinelle cuprokalininite , kalininite and florensovite , the oxispinel magnesiocoulsonite and the group silicate batisivite .

In Canada , an exotic vanadium- scandium - niobium mineralization was found in metasomatically altered volcanic breccias of Deadhorse Creek in the Walsh Township of the Thunder Bay District in Ontario . Natalyit- Jervisit - Aegirin -Mischkristalle come here accessorisch with Allanit , barite , Barylit , Coffinite , magnetite , monazite - (Ce), niobium and vanadium-rich rutile , pyrite , thorite , thorogummite , Thortveitit , uraninite , vanadium-rich Crichtonit , xenotime - (Y) and zirconium -Thorit-Coffinit mixed crystals on.

The Srednjaja Padma Mine (Средняя Падма) belongs to the Velikaya Guba uranium-vanadium deposit (Великая Губа) on the Saonezhye (Заонежье) peninsula of Lake Onega in the Republic of Karelia , Russia. Here you will find aegirine-natalyite mixed crystals with chrome-rich tourmalines, chalcopyrite , clausthalite in a matrix of roscoelite , nolanite , chrome celadonite , dolomite and calcite .

literature

  • Л. З. Резницкий, Е. В. Скляров, З. Ф. Ущаповская: наталиит Na (V, Cr) Si 2 O 6 - новый хромо-ванадиевый Пироксен из слюдянки . In: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva . tape 114 , no. 5 , 1985, pp. 630–635 (Russian, rruff.info [PDF; 750 kB ; accessed on July 28, 2019]).
  • FC Hawthorne, KW Bladh, EAJ Burke, ES Grew, RH Langley, J. Puciewicz, AC Roberts, RA Schedler, JE Shigley, DA Vanko: New mineral names . In: American Mineralogist . tape 72 , 1987, pp. 222–230 (English, rruff.info [PDF; 1.3 MB ; accessed on July 28, 2019]).
  • Angela Ullrich, Ronald Miletich, Fabrizio Nestola, Christian Weikusat, Haruo Ohashi: Lattice compression and structural behavior of NaVSi 2 O 6 clinopyroxene to 11 GPa . In: American Mineralogist . tape 94 , 2009, p. 557-564 (English, rruff.info [PDF]).

Web links

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

Individual evidence

  1. ↑ Natalyite. In: rruff.info. IMA Database of Mineral Properties, accessed July 30, 2019 .
  2. ↑ a b c d e f Natalyite. In: mindat.org. Hudson Institute of Mineralogy, accessed July 30, 2019 .
  3. ↑ a b c Angela Ullrich, Ronald Miletich, Fabrizio Nestola, Christian Weikusat and Haruo Ohashi: Lattice compression and structural behavior of NaVSi2O6 clinopyroxene to 11 GPa . In: The American Mineralogist . tape 94 , 2009, p. 557–564 (English, rruff.info [PDF; 335 kB ; accessed on March 2, 2019]).
  4. ↑ a b c d e f g h i j k l m n o p q r s t LZ Reznitskii, EV Skliarov, ZF Ushchapovskaia: Na-talyite Na (V, Cr) SirOu -A new chromium-vanadium pyroxenefrom Slyudianka. In: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva . tape 114 (5) , 1985, pp. 630-635 (Russian).
  5. ↑ a b c d e f g h i j k l m n o p q r s t FC Hawthorne, KW Bladh, EAJ Burke, ES Grew, RH Langley, J. Puciewicz, AC Robberts, RA Schelder, JE Shigley, DA Vanko: New mineral names - Natalyite. In: The American Mineralogist . tape 72 , 1987, pp. 222–230 (English, minsocam.org [PDF; 1.3 MB ; accessed on March 2, 2019]).
  6. ↑ a b List of locations for natalyite in the Mineralienatlas and Mindat
  7. ↑ Haruo Ohashi, Taketoshi Fujita and Nobuo Ii: STRUCTURE OF Ca1.00Sc0.84Ti0.27Al1.16Si0.73O6 PYROXENE . In: Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists . tape 74 , 1979, pp. 280–286 (English, jst.go.jp [PDF; 281 kB ; accessed on March 3, 2019]).
  8. ↑ a b c H. Ohashi, T. Osawa and A. Sato: NaVSi2O6 . In: Acta Crystallographica . C50, 1994, pp. 1652–1655 , doi : 10.1107 / S0108270194004567 (English).
  9. ↑ a b Subcommite on Pyroxenes, CNMMN; Nobuo Morimoto: Nomenclature of Pyroxenes . In: The Canadian Mineralogist . tape 27 , 1989, pp. 143–156 ( mineralogicalassociation.ca [PDF; 1.6 MB ; accessed on November 11, 2018]).
  10. ^ L. Secco, F. Martignago, A. Dal Negro, LZ Reznitskii, and EV Sklyarov: Crystal chemistry of Cr3 + -V3 + -rich clinopyroxenes . In: The American Mineralogist . tape 87 , 2002, pp. 709–714 (English, rruff.info [PDF; 343 kB ; accessed on March 2, 2019]).
  11. ^ A b Eric G. Potter, Roger H. Mitchell: Mineralogy of the deadhorse creek volcaniclastic breccia complex, northwestern Ontario, Canada . In: Contributions to Mineralogy and Petrology . tape 150 (2) , 2005, pp. 212-229 , doi : 10.1007 / s00410-005-0014-y (English).
  12. ↑ AP Borozdin, Yu. S. Polekhovskii, SA Bushmin, VA Glebovitskii, BV Belyatskii and EV Savva: Age of Metasomatism and Ore Formation in the Srednyaya Padma Vanadium – Precious Metals – Uranium Deposit (Karelia, Baltic Shield) . In: Doklady Earth Sciences . tape 454 (1) , 2014, pp. 68–71 (English, researchgate.net [PDF; 517 kB ; accessed on March 3, 2019]).
  13. ↑ Photos of Natalyit. In: mindat.org. Hudson Institute of Mineralogy, accessed July 30, 2019 .