Lepkhenelmite-Zn
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About Lepkhenelmite-Zn
Formula:
(Ba,K)2Zn(Ti,Nb)4(Si4O12)2(O,OH)4 · 7H2O
Colour:
pale brown
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
2.96
Crystal System:
Monoclinic
Member of:
Name:
For the type locality and zinc being the prevalent element occupying the D sites.
Classification of Lepkhenelmite-Zn
Approved
Approval Year:
2003
8/E.07-220
9.CE.30c
9 : SILICATES (Germanates)
C : Cyclosilicates
E : [Si4O12]8- 4-membered single rings (vierer-Einfachringe), without insular complex anions
9 : SILICATES (Germanates)
C : Cyclosilicates
E : [Si4O12]8- 4-membered single rings (vierer-Einfachringe), without insular complex anions
Physical Properties of Lepkhenelmite-Zn
Vitreous
Transparency:
Transparent, Translucent
Colour:
pale brown
Streak:
white
Hardness:
5 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Density:
2.96 g/cm3 (Measured)
Optical Data of Lepkhenelmite-Zn
Type:
Biaxial
RI values:
nα = 1.683 nβ = 1.692 nγ = 1.795
2V:
Measured: 25°
Max Birefringence:
δ = 0.112

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Chemical Properties of Lepkhenelmite-Zn
Formula:
(Ba,K)2Zn(Ti,Nb)4(Si4O12)2(O,OH)4 · 7H2O
IMA Formula:
Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4 · 7H2O
Common Impurities:
Al,Ca,Fe,K,Mg,Mn,Na,Sr
Crystallography of Lepkhenelmite-Zn
Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Bm
Cell Parameters:
a = 14.38 Å, b = 13.89 Å, c = 7.793 Å
β = 117.52°
β = 117.52°
Ratio:
a:b:c = 1.035 : 1 : 0.561
Unit Cell V:
1380.4 ų
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.194 | (100) |
6.95 | (37) |
3.101 | (22) |
6.39 | (10) |
3.050 | (8) |
Type Occurrence of Lepkhenelmite-Zn
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:
Synonyms of Lepkhenelmite-Zn
Other Language Names for Lepkhenelmite-Zn
Relationship of Lepkhenelmite-Zn to other Species
Member of:
Other Members of this group:
Burovaite-Ca | (Na,K)4Ca2(Ti,Nb)8(Si4O12)4(OH,O)8 · 12H2O | Mon. 2/m : B2/m |
Gjerdingenite-Ca | K2Ca(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O | Mon. 2/m : B2/m |
Gjerdingenite-Fe | K2Fe2+(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O | Mon. 2/m : B2/m |
Gjerdingenite-Mn | K2Mn2+(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O | Mon. 2/m : B2/m |
Gjerdingenite-Na | K2Na(Nb,Ti)4(Si4O12)2(OH,O)4 · 5H2O | Mon. 2/m : B2/m |
Karupmøllerite-Ca | (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4 · 7H2O | |
Kuzmenkoite-Mn | K2Mn2+(Ti,Nb)4(Si4O12)2(OH,O)4 · 5-6H2O | Mon. |
Kuzmenkoite-Zn | K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4·6-8H2O | Mon. m : Bm |
Related Minerals - Nickel-Strunz Grouping
9.CE.05 | Papagoite | CaCu[H3AlSi2O9] | Mon. |
9.CE.10 | Verplanckite | Ba2(Mn,Fe,Ti)Si2O6(O,OH,Cl,F)2 · 3H2O or near | Hex. |
9.CE.15 | Baotite | Ba4Ti8Si4O28Cl | Tet. 4/m : I41/a |
9.CE.20 | Nagashimalite | Ba4(V,Ti)4B2Si8O27(O,OH)2Cl | Orth. mmm (2/m 2/m 2/m) : Pmmn |
9.CE.20 | Taramellite | Ba4(Fe3+,Ti,Fe2+,Mg)4(B2Si8O27)O2Clx | Orth. mmm (2/m 2/m 2/m) : Pmmn |
9.CE.20 | Titantaramellite | Ba4(Ti,Fe3+,Fe2+,Mg)4(B2Si8O27)O2Clx | Orth. |
9.CE.25 | Bario-orthojoaquinite | (Ba,Sr)4Fe2Ti2[Si4O12]2O2 · H2O | Orth. |
9.CE.25 | Byelorussite-(Ce) | NaBa2Ce2MnTi2[Si4O12]2O2(F,OH) · H2O | |
9.CE.25 | Joaquinite-(Ce) | NaBa2Ce2FeTi2[Si4O12]2O2(OH,F) · H2O | Mon. 2 : B2 |
9.CE.25 | Orthojoaquinite-(Ce) | NaBa2Ce2FeTi2[Si4O12]2O2(O,OH) · H2O | |
9.CE.25 | Strontiojoaquinite | Sr2Ba2(Na,Fe)2Ti2[Si4O12]2O2(O,OH)2 · H2O | Mon. |
9.CE.25 | Strontio-orthojoaquinite | (Na,Fe)2Sr2Ba2Ti2[Si4O12]2O2(O,OH)2 · H2O | Orth. |
9.CE.25 | Orthojoaquinite-(La) | NaBa2La2Fe2+Ti2[Si4O12]2O2(O,OH) · H2O | Orth. |
9.CE.30e | Labuntsovite-Mn | Na4K4(Ba,K)2Mn2+(Ti,Nb)8(Si4O12)4(O,OH)8 · 10-12H2O | Mon. |
9.CE.30a | Nenadkevichite | (Na,⃞)8Nb4(Si4O12)2(O,OH)4 · 8H2O | Orth. mmm (2/m 2/m 2/m) : Pbam |
9.CE.30d | Lemmleinite-K | K2(Ti,Nb)2(Si4O12)(OH,O)2 · 4H2O | Orth. |
9.CE.30a | Korobitsynite | Na2(Ti,Nb)2(Si4O12)(OH,O)2 · 3-4H2O | Orth. mmm (2/m 2/m 2/m) : Pbam |
9.CE.30c | Kuzmenkoite-Mn | K2Mn2+(Ti,Nb)4(Si4O12)2(OH,O)4 · 5-6H2O | Mon. |
9.CE.30b | Vuoriyarvite-K | K2(Nb,Ti)2(Si4O12)(O,OH)2 · 4H2O | Mon. |
9.CE.30b | Tsepinite-Na | Na2(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O | Mon. |
9.CE.30c | Karupmøllerite-Ca | (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4 · 7H2O | |
9.CE.30e | Labuntsovite-Mg | Na4K4(Ba,K)2Mg(Ti,Nb)8(Si4O12)4(O,OH)8 · 10H2O | Mon. |
9.CE.30e | Labuntsovite-Fe | Na4K4(Ba,K)2Fe2+(Ti,Nb)8(Si4O12)4(O,OH)8 · 10H2O | Mon. |
9.CE.30d | Lemmleinite-Ba | Na2K2Ba(Ti,Nb)4(Si4O12)2(O,OH)4 · 5H2O | Mon. 2/m : B2/m |
9.CE.30c | Gjerdingenite-Fe | K2Fe2+(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O | Mon. 2/m : B2/m |
9.CE.30h | Neskevaaraite-Fe | K3Na2Fe2+(Ti,Nb)4(Si4O12)2(O,OH)4 · 5-6 H2O | Mon. m : Bm |
9.CE.30b | Tsepinite-K | K2(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O | Mon. 2/m : B2/m |
9.CE.30b | Paratsepinite-Ba | Ba4(Ti,Nb)8(Si4O12)4(OH,O)8 · 8H2O | |
9.CE.30b | Tsepinite-Ca | Ca(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O | Mon. 2/m : B2/m |
9.CE.30h | Alsakharovite-Zn | NaSrKZn(Ti,Nb)4(Si4O12)2(O,OH)4 · 7H2O | Mon. m : Bm |
9.CE.30c | Gjerdingenite-Mn | K2Mn2+(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O | Mon. 2/m : B2/m |
9.CE.30b | Tsepinite-Sr | Sr(Ti,Nb)2(Si4O12)(OH,O)2 · 3H2O | Mon. m : Bm |
9.CE.30b | Paratsepinite-Na | (Na,Sr,K,Ca)7(Ti,Nb)8(Si4O12)4(O,OH)8·nH2O n ~ 8 | Mon. 2/m : B2/m |
9.CE.30f | Paralabuntsovite-Mg | Na8K8Mg4Ti16(Si4O12)8(OH,O)16 · 20-24H2O | Mon. 2/m |
9.CE.30c | Gjerdingenite-Ca | K2Ca(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O | Mon. 2/m : B2/m |
9.CE.30c | Gjerdingenite-Na | K2Na(Nb,Ti)4(Si4O12)2(OH,O)4 · 5H2O | Mon. 2/m : B2/m |
9.CE.30h | Gutkovaite-Mn | K2CaMn(Ti,Nb)4(Si4O12)2(O,OH)4 · 5H2O | Mon. |
9.CE.30c | Kuzmenkoite-Zn | K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4·6-8H2O | Mon. m : Bm |
9.CE.30g | Organovaite-Mn | K2Mn(Nb,Ti)4(Si4O12)2(O,OH)4 · 5-7H2O | Mon. 2/m : B2/m |
9.CE.30g | Organovaite-Zn | K2Zn(Nb,Ti)4(Si4O12)2(O,OH)4 · 6H2O | |
9.CE.30g | Parakuzmenkoite-Fe | (K,Ba)4Fe(Ti,Nb)8(Si4O12)4(O,OH)8 · 14H2O | Mon. 2/m : B2/m |
9.CE.30c | Burovaite-Ca | (Na,K)4Ca2(Ti,Nb)8(Si4O12)4(OH,O)8 · 12H2O | Mon. 2/m : B2/m |
9.CE.45 | Komarovite | (Ca,Mn)Nb2[O3|Si2O7] · 3.5H2O | Orth. |
9.CE.45 | Natrokomarovite | (Na,Ca,H)2Nb2Si2O10(OH,F)2 · H2O | Orth. |
Fluorescence of Lepkhenelmite-Zn
none
Other Information
Health Risks:
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:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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
mindat.org URL:
https://www.mindat.org/min-26521.html
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External Links:
Mineral Dealers:
Localities for Lepkhenelmite-Zn
Locality List




All localities listed without proper references should be considered as questionable.
Russia (TL) | |
| I.V. Pekov et al.: Zap. Vses. Mineral. Obshch. 133(1):49-59 (2004) |
Lepkhe-Nel'm Mt, Seidozero Lake, Lovozero Massif, Murmansk Oblast, Russia