sábado, 30 de agosto de 2014

Sveite, Nuevo mineral descubierto en Venezuela

Fuente: http://www.mindat.org/min-3838.html
Formula:
KAl
7
(NO
3
)
4
(OH)
16
Cl
2
· 8H
2
O
System:MonoclinicColour:White
Name:From SVE, the acronym for the Sociedad Venezolana de Espeleogia, whose members collected the original specimen.
This page provides mineralogical data about Sveite.

Classification of Sveite

IMA status:Approved 1980
Strunz 8th edition ID:5/A.04-10
Nickel-Strunz 10th (pending) edition ID:5.ND.20

5 : CARBONATES (NITRATES)
N : NITRATES
D : With OH (etc.) and H2O
Dana 7th edition ID:19.2.3.1
Dana 8th edition ID:19.1.3.1

19 : NITRATES CONTAINING HYDROXYL OR HALOGEN
1 : Anhydrous Nitrates Containing Hydroxyl or Halogen
Hey's CIM Ref.:13.8

13 : Nitrates
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Type Occurrence of Sveite

Type Locality:Cueva del Cerro Autana (Autana Cave), Amazonas, Venezuela
Year of Discovery:1980

Physical Properties of Sveite

Colour:White

Crystallography of Sveite

Crystal System:Monoclinic
Cell Parameters:a = 10.89Å, b = 13.04Å, c = 30.71Å
β = 92.1°
Ratio:a:b:c = 0.835 : 1 : 2.355
Unit Cell Volume:V 4,358.06 ų (Calculated from Unit Cell)

Optical Data of Sveite

Type:Biaxial (+)
RI values:nα = 1.501 nβ = 1.503 nγ = 1.535
2V:Calculated: 30°
Maximum Birefringence:δ = 0.034

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:relatively strong

Chemical Properties of Sveite

Formula:
KAl
7
(NO
3
)
4
(OH)
16
Cl
2
· 8H
2
O
Simplified for copy/paste:KAl7(NO3)4(OH)16Cl2·8H2O
Essential elements:Al, Cl, H, K, N, O
All elements listed in formula:Al, Cl, H, K, N, O

Relationship of Sveite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
5.ND.05Likasite
Cu
3
(NO
3
)(OH)
5
· 2H
2
O
5.ND.10Mbobomkulite
(Ni,Cu)Al
4
((NO
3
)
2
,SO
4
)(OH)
12
· 3H
2
O
5.ND.15Hydrombobomkulite
(Ni,Cu)Al
4
((NO
3
)
2
,SO
4
)(OH)
12
· 13-14H
2
O
Related Minerals - Hey's Index Grouping:

- +
13.1Nitratine
NaNO
3
13.2Niter
KNO
3
13.3Gerhardtite
Cu
2
(NO
3
)(OH)
3
13.4Nitromagnesite
Mg(NO
3
)
2
· 6H
2
O
13.5Nitrocalcite
Ca(NO
3
)
2
· 4H
2
O
13.6Nitrobarite
Ba(NO
3
)
2
13.7Buttgenbachite
Cu
19
(NO
3
)
2
(OH)
32
Cl
4
· 2H
2
O
13.9Darapskite
Na
3
(SO
4
)(NO
3
) · H
2
O
13.10Humberstonite
Na
7
K
3
Mg
2
(SO
4
)
6
(NO
3
)
2
· 6H
2
O
13.11Mbobomkulite
(Ni,Cu)Al
4
((NO
3
)
2
,SO
4
)(OH)
12
· 3H
2
O
13.12Hydrombobomkulite
(Ni,Cu)Al
4
((NO
3
)
2
,SO
4
)(OH)
12
· 13-14H
2
O
13.13Nickelalumite
(Ni,Cu)Al
4
(SO
4
,(NO
3
)
2
)(OH)
12
· 3H
2
O

Other Names for Sveite

Synonyms:
IMA1980-005
Other Languages:
German:Sveit
Spanish:Sveita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Sveite

Reference List:

- +
Bol. Soc. Venezolano Espeleologia (1980), 21, 13-16.

American Mineralogist (1982): 67: 1076.

Transactions of the Geological Society of South Africa: 83: 239-241.

Internet Links for Sveite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Sveite details from Handbook of Mineralogy (PDF)

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  • Localities for Sveite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    USA
    • California
    • San Joaquin Co.
    OCCURRENCE AND PROPERTIES OF SVEITE IN THE NORTHEASTERN SAN JOAQUIN VALLEY, CALIFORNIA-- R. C. Graham, J. O. Ervin, and W. M. Graham in Clays and Clay Minerals, Vol. 36, No. 6, 580-583, 1988.
    Venezuela
    • Amazonas
    J.E.J. Martini, (1980) Sveite, a new mineral from Autana Cave, Territorio Federal Amazonas, Venezuela Trans. Geol. Soc. S. Africa, 83, 239-241.