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Lepkhenelmite-Zn

Big Photo

Lepkhe-Nel'm Mt. (Lepkhe-Nelm Mt.), Seidozero Lake, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© 2008, J. Weissman

Formula:
(Ba,K)
 
2
Zn(Ti,Nb)
 
4
[(O,OH)
 
2
|Si
 
4
O
 
12
]
 
2
 · 7H
 
2
O
System:MonoclinicColour:pale brown
Hardness:5
Name:For the type locality and zinc being the prevalent element occupying the D sites.


Labuntsovite Group. The barium analogue of Kuzmenkoite-Zn.

Classification of Lepkhenelmite-Zn

IMA status:Approved 2003
Strunz 8th edition ID:8/E.07-220
Nickel-Strunz 10th (pending) edition ID:9.CE.30c

9 : SILICATES (Germanates)
C : Cyclosilicates
E : [Si4O12]8- 4-membered single rings (vierer-Einfachringe), without insular complex anions
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Type Occurrence of Lepkhenelmite-Zn

Type Locality:Pegmatite No. 45, Lepkhe-Nel'm Mt. (Lepkhe-Nelm Mt.), Seidozero Lake, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
General Appearance of Type Material:coarse flattened-prismatic crystals up to 7 x 2.5 x 0.5 mm and crystal clusters up to 1 x 0.5 cm
Geological Setting of type material:a hydrothermally formed mineral, occurring in cavities of an eudialyte-aegirine-feldspar pegmatite
Associated Minerals at type locality:
VinogradoviteTsepinite-NaRanciéiteNatroliteLamprophyllite
Kuzmenkoite-MnHalloysiteEudialyteApatiteAlsakharovite-Zn
Aegirine

Physical Properties of Lepkhenelmite-Zn

Lustre:Vitreous
Diaphaneity (Transparency):Transparent, Translucent
Colour:pale brown
Streak:white
Hardness (Mohs):5
Tenacity:Brittle
Cleavage:None Observed
Density (measured):2.96 g/cm3

Crystallography of Lepkhenelmite-Zn

Crystal System:Monoclinic
Class (H-M):m - Domatic
Space Group:Bm (B1 1m) [Cm] {C1m1}
Cell Parameters:a = 14.38Å, b = 13.89Å, c = 7.793Å
β = 117.52°
Ratio:a:b:c = 1.035 : 1 : 0.561
Unit Cell Volume:V 1380.4 ų
Z:2
X-Ray Powder Diffraction:
d-spacingIntensity
3.194 (100)
6.95 (37)
3.101 (22)
6.39 (10)

Optical Data of Lepkhenelmite-Zn

Type:Biaxial
RI values: nα = 1.683 nβ = 1.692 nγ = 1.795
2V:Measured: 25°
Maximum Birefringence:δ = 0.112

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

Chemical Properties of Lepkhenelmite-Zn

Formula:
(Ba,K)
 
2
Zn(Ti,Nb)
 
4
[(O,OH)
 
2
|Si
 
4
O
 
12
]
 
2
 · 7H
 
2
O
Essential elements:
All elements listed in formula:Ba, H, K, Nb, O, Si, Ti, Zn
Analyical Data:method for determination of water not known, all others determined by means of electron microprobe analysis
SiO2 (37.01)
TiO2 (18.56)
Nb2O3 (10.60)
Al2O3 (0.42)
ZnO (3.66)
FeO (0.21)
MnO (0.81)
MgO (0.02)
BaO (11.04)
SrO (1.79)
CaO (1.16)
Na2O (0.59)
K2O (1.98)

H2O (11.80)
Common Impurities:Al,Ca,Fe,K,Mg,Mn,Na,Sr

Relationship of Lepkhenelmite-Zn to other Species

Related Minerals - Nickel-Strunz Grouping):
9.CE.05Papagoite
CaCu[H
 
3
AlSi
 
2
O
 
9
]
9.CE.10Verplanckite
Ba
 
2
(Mn,Fe,Ti)Si
 
2
O
 
6
(O,OH,Cl,F)
 
2
·3H
 
2
O or near
9.CE.15Baotite
Ba
 
4
(Ti,Nb)
 
8
Si
 
4
O
 
28
Cl
9.CE.20Nagashimalite
Ba
 
4
(V,Ti)
 
4
B
 
2
Si
 
8
O
 
27
(O,OH)
 
2
Cl
9.CE.20Taramellite
Ba
 
4
(Fe
3+
 
,Ti,Fe
2+
 
,Mg)
 
4
(B
 
2
Si
 
8
O
 
27
)O
 
2
Cl
 
x
9.CE.20Titantaramellite
Ba
 
4
(Ti,Fe
3+
 
,Fe
2+
 
,Mg)
 
4
(B
 
2
Si
 
8
O
 
27
)O
 
2
Cl
 
x
9.CE.25Bario-orthojoaquinite
(Ba,Sr)
 
4
Fe
 
2
Ti
 
2
Si
 
8
O
 
26
·H
 
2
O
9.CE.25Byelorussite-(Ce)
Ba
 
2
NaCe
 
2
MnTi
 
2
Si
 
8
O
 
26
(F,OH) · H
 
2
O
9.CE.25Joaquinite-(Ce)
Ba
 
2
NaCe
 
2
FeTi
 
2
Si
 
8
O
 
26
(OH,F) · H
 
2
O
9.CE.25Orthojoaquinite-(Ce)
Ba
 
2
NaCe
 
2
FeTi
 
2
Si
 
8
O
 
26
(O,OH) · H
 
2
O
9.CE.25Strontiojoaquinite
Sr
 
2
Ba
 
2
(Na,Fe)
 
2
Ti
 
2
Si
 
8
O
 
24
(O,OH)
 
2
·H
 
2
O
9.CE.25Strontio-orthojoaquinite
Sr
 
2
Ba
 
2
(Na,Fe)
 
2
Ti
 
2
Si
 
8
O
 
24
(O,OH)
 
2
·H
 
2
O
9.CE.25Orthojoaquinite-(La)
Ba
 
2
NaLa
 
2
Fe
2+
 
Ti
 
2
Si
 
8
O
 
26
(O,OH)·H
 
2
O
9.CE.30eLabuntsovite-Mn
Na
 
4
K
 
4
(Ba,K)
 
2
Mn
2+
 
(Ti,Nb)
 
8
[(O,OH)
 
2
|Si
 
4
O
 
12
]
 
4
 · 10-12H
 
2
O
9.CE.30aNenadkevichite
(Na,Ca)(Nb,Ti)Si
 
2
O
 
7
·2H
 
2
O
9.CE.30dLemmleinite-K
K
 
2
(Ti,Nb)
 
2
[(OH,O)
 
2
|Si
 
4
O
 
12
] · 4H
 
2
O
9.CE.30aKorobitsynite
Na
 
2
(Ti,Nb)
 
2
[(OH,O)
 
2
|Si
 
4
O
 
12
] · 3-4H
 
2
O
9.CE.30cKuzmenkoite-Mn
K
 
2
Mn
2+
 
(Ti,Nb)
 
4
[(OH,O)
 
2
|Si
 
4
O
 
12
]
 
2
 · 5H
 
2
O
9.CE.30bVuoriyarvite-K
K
 
2
(Nb,Ti)
 
2
[(O,OH)
 
2
|Si
 
4
O
 
12
] · 4H
 
2
O
9.CE.30bTsepinite-Na
Na
 
2
(Ti,Nb)
 
2
[(OH,O)
 
2
|Si
 
4
O
 
12
] · 3H
 
2
O
9.CE.30cKarupmøllerite-Ca
(Na,Ca,K)
 
2
Ca(Nb,Ti)
 
4
[(O,OH)
 
2
|Si
 
4
O
 
12
]
 
2
 · 7H
 
2
O
9.CE.30eLabuntsovite-Mg
Na
 
4
K
 
4
(Ba,K)
 
2
Mg(Ti,Nb)
 
8
[(O,OH)
 
2
|Si
 
4
O
 
12
]
 
4
 · 10H
 
2
O
9.CE.30eLabuntsovite-Fe
Na
 
4
K
 
4
(Ba,K)
 
2
Fe
2+
 
(Ti,Nb)
 
8
[(O,OH)
 
2
|Si
 
4
O
 
12
]
 
4
 · 10H
 
2
O
9.CE.30dLemmleinite-Ba
Na
 
2
K
 
2
Ba(Ti,Nb)
 
4
[(O,OH)
 
2
|Si
 
4
O
 
12
]
 
2
 · 5H
 
2
O
9.CE.30cGjerdingenite-Fe
K
 
2
Fe
2+
 
(Nb,Ti)
 
4
[(O,OH)
 
2
|Si
 
4
O
 
12
]
 
2
 · 6H
 
2
O
9.CE.30hNeskevaaraite-Fe
K
 
3
Na
 
2
Fe
2+
 
(Ti,Nb)
 
4
[(O,OH)
 
2
|Si
 
4
O
 
12
]
 
2
 · 5-6 H
 
2
O
9.CE.30bTsepinite-K
K
 
2
(Ti,Nb)
 
2
[(OH,O)
 
2
|Si
 
4
O
 
12
] · 3H
 
2
O
9.CE.30bParatsepinite-Ba
Ba
 
4
(Ti,Nb)
 
8
[(OH,O)
 
2
|Si
 
4
O
 
12
]
 
4
 · 8H
 
2
O
9.CE.30bTsepinite-Ca
Ca(Ti,Nb)
 
2
[(OH,O)
 
2
|Si
 
4
O
 
12
] · 3H
 
2
O
9.CE.30hAlsakharovite-Zn
NaSrKZn(Ti,Nb)
 
4
(Si
 
4
O
 
12
)
 
2
(O,OH)
 
4
 · 7 H
 
2
O
9.CE.30cGjerdingenite-Mn
K
 
2
Mn
2+
 
(Nb,Ti)
 
4
[(O,OH)
 
2
|Si
 
4
O
 
12
]
 
2
 · 6H
 
2
O
9.CE.30bTsepinite-Sr
Sr(Ti,Nb)
 
2
[(OH,O)
 
2
|Si
 
4
O
 
12
] · 3H
 
2
O
9.CE.30bParatsepinite-Na
(Na,Sr,K,Ca)
 
7
(Ti,Nb)
 
8
[Si
 
4
O
 
12
]
 
4
(O,OH)
 
8
·nH
 
2
O n ~ 8
9.CE.30fParalabuntsovite-Mg
Na
 
8
K
 
8
Mg
 
8
Ti
 
16
(Si
 
4
O
 
12
)
 
8
(O,OH)
 
16
· n(H
 
2
O)
9.CE.30cGjerdingenite-Ca
K
 
2
Ca(Nb,Ti)
 
4
[(O,OH)
 
2
|Si
 
4
O
 
12
]
 
2
 · 6H
 
2
O
9.CE.30cGjerdingenite-Na
K
 
2
Na
 
2
(Nb,Ti)
 
4
[(OH,O)
 
2
|Si
 
4
O
 
12
]
 
2
 · 5H
 
2
O
9.CE.30hGutkovaite-Mn
K
 
2
CaMn(Ti,Nb)
 
4
[(O,OH)
 
2
|Si
 
4
O
 
12
]
 
2
 · 5H
 
2
O
9.CE.30cKuzmenkoite-Zn
K
 
2
Zn(Ti,Nb)
 
4
(Si
 
4
O
 
12
)
 
2
(OH,O)
 
4
·6-8H
 
2
O
9.CE.30gOrganovaite-Mn
K
 
2
Mn(Nb,Ti)
 
4
[(O,OH)
 
2
|Si
 
4
O
 
12
]
 
2
 · 6H
 
2
O
9.CE.30gOrganovaite-Zn
K
 
2
Zn(Nb,Ti)
 
4
[(O,OH)
 
2
|Si
 
4
O
 
12
]
 
2
 · 6H
 
2
O
9.CE.30gParakuzmenkoite-Fe
(K,Ba)
 
4
Fe(Ti,Nb)
 
8
[(O,OH)
 
2
|Si
 
4
O
 
12
]
 
4
 · 14H
 
2
O
9.CE.30cIMA2008-001
(K,Na,Sr,Ba)
 
4
Ca
 
2
(Ti,Nb)
 
8
[Si
 
4
O
 
12
]
 
4
(OH,O)
 
8
·12H
 
2
O
9.CE.45Komarovite
(Ca,Mn)Nb
 
2
[O
 
3
|Si
 
2
O
 
7
] · 3.5H
 
2
O
9.CE.45Natrokomarovite
(Na,Ca,H)
 
2
Nb
 
2
Si
 
2
O
 
10
(OH,F)
 
2
·H
 
2
O

Other Names for Lepkhenelmite-Zn

Synonyms:
IMA2003-003
Russian names:
Лепхенельмит-Zn

Other Information

Fluorescence in UV light:none
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 Lepkhenelmite-Zn

Reference List:Pekov, I.V., N.V. Chukanov, G.V. Shilov, N.N. Kononkova, A.E. Zadov (2004): "Lepkhenelmite-Zn, Ba2Zn(Ti,Nb)4[Si4O12]2(O,OH)4 • 7H2O, a new mineral of the labuntsovite group and its crystal structure", Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva (Proceedings of the Russian Mineralogical Society): 133(1): 49-59.

Internet Links for Lepkhenelmite-Zn

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    Localities for Lepkhenelmite-Zn

    (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.
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Lovozero Massif
            • Seidozero Lake
              • Lepkhe-Nel'm Mt. (Lepkhe-Nelm Mt.)
    		I.V. Pekov et al.: Zap. Vses. Mineral. Obshch. 133(1):49-59 (2004)
    Mineral and/or Locality
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