Lepkhenelmite-Zn Mineral Data

[Mineral Auctions] [Register] [Current Auctions] [Log In] [www.danweinrich.com]
Dan Weinrich Auctions
Specializing In Live Weekly Auctions Of Top Quality Mineral Specimens
The Place To Find Great Specimens At Great Prices!

General Lepkhenelmite-Zn Information

Chemical Formula:

Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O)

Composition:

Molecular Weight = 1,261.08 gm

Potassium 1.64 % K 1.98 % K₂O

Barium 9.91 % Ba 11.06 % BaO

Sodium 0.44 % Na 0.59 % Na₂O

Strontium 1.53 % Sr 1.81 % SrO

Calcium 0.83 % Ca 1.16 % CaO

Magnesium 0.02 % Mg 0.03 % MgO

Titanium 11.16 % Ti 18.62 % TiO₂

Manganese 0.61 % Mn 0.79 % MnO

Niobium 7.44 % Nb 10.64 % Nb₂O₅

Aluminum 0.21 % Al 0.40 % Al₂O₃

Zinc 2.96 % Zn 3.68 % ZnO

Iron 0.18 % Fe 0.23 % FeO

Silicon 17.37 % Si 37.16 % SiO₂

Hydrogen 1.33 % H 11.84 % H₂O

Oxygen 44.38 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ba_0.91K_0.53Ca_0.26Na_0.24Sr_0.22Zn_0.57Mn²⁺_0.14Fe²⁺_0.04Mg_0.01Ti_2.94Nb_1.01Si_7.8Al_0.1O₂₄ O_1.38(OH)_2.62·6.98(H₂O)

Environment:

A hydrothermal mineral in cavities of a eudialyte - aegirine - feldspar pegmatite. Kuzmenkoite subgroup with dominance of Zn in the D structural site.

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Lepkhe-Nelm Mountain, Lovozero alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named after the locality and composition.

Synonym:

IMA2003-003

Lepkhenelmite-Zn Image

Images:

Lepkhenelmite-Zn

Comments: B&W image of fragments of lepkhenelmite-Zn.
Location: Lepkhe-Nel'm Mt., Lovozero, Kola, Russia. Scale: See Image.
© Diederik Visser

Lepkhenelmite-Zn Crystallography

Axial Ratios:

a:b:c =1.0354:1:0.561

Cell Dimensions:

a = 14.381, b = 13.889, c = 7.793, Z = 2; beta = 117.52° V = 1,380.43 Den(Calc)= 3.03

Crystal System:

Monoclinic - DomaticH-M Symbol (m) Space Group: Cm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.194(1)(421,402,400), 6.39(1)(201,200), 3.05(0.8)(241,240), 2.585(0.6)(242,241), 2.906(0.6)(422,420), 4.912(0.6)(021), 6.95(0.37)(020,001), 3.101(0.22)(041,022)

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Pekov I V , Chukanov N V , Shilov G V , Kononkova N N , Zadov A E , Zapiski Vserossijskogo Mineralogicheskogo Obshchestva , 133 (2004) p.49-59, Lepkhenelmite-Zn, Ba2Zn(Ti,Nb)4[Si4O12]2(O,OH)4*7(H2O) - a new mineral of the, labuntsovite group and its crystal structure, Locality: Lepkhe-Nelm Mt, Lovozero, Kola Peninsula, Russia, Note: y(M1) corrected

Physical Properties of Lepkhenelmite-Zn

Cleavage:

None

Color:

Pale brown.

Density:

2.96

Diaphaneity:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Lepkhenelmite-Zn

Gladstone-Dale:

CI meas= 0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.053 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2387,KPDmeas= 0.2444,KC= 0.2522
Ncalc = 1.75 - 1.76

Optical Data:

Biaxial (+), a=1.683, b=1.692, g=1.795, bire=0.1120, 2V(Calc)=36, 2V(Meas)=30. Dispersion dispersion not observed.

Calculated Properties of Lepkhenelmite-Zn

Electron Density:

Bulk Density (Electron Density)=2.87 gm/cc
note: Specific Gravity of Lepkhenelmite-Zn =2.96 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_{Lepkhenelmite-Zn}= 57.94 barns/electron
U=PE_{Lepkhenelmite-Zn} x r_electron= 166.45 barns/cc.

Radioactivity:

GRapi = 23.02 (Gamma Ray American Petroleum Institute Units)
Concentration of Lepkhenelmite-Zn per GRapi unit = 4.34 (%)

Estimated Radioactivity from Lepkhenelmite-Zn - barely detectable

Lepkhenelmite-Zn Classification

Dana Class:

60.01.03c.04 (60)Cyclosilicate Four-Membered Rings

(60.01)as Titanosilicates

(60.01.03c)Labuntsovite Group (Kuzmenkoite subgroup Monoclinic [C2/m])

60.01.03c.01 Kuzmenkoite-Mn! (K,Na)2(Mn,Fe)(Ti,Nb)4[Si4O12]2(OH)4•5(H2O) C 2/m 2/m

60.01.03c.02 Kuzmenkoite-Zn! K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4•6-8(H2O) Cm m

60.01.03c.03 Karupmollerite-Ca! (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4•7(H2O) C 2/m 2/m

60.01.03c.04 Lepkhenelmite-Zn! Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O) Cm m

Strunz Class:

09.CE.30c 09 - SILICATES (Germanates)

09.C - Cyclosilicates

09.CE -[Si4O12]8- 4-membered single rings (vierer-Einfachringe),

09.CE.30c Gjerdingenite-Mn! (K,Na)2(Mn,Fe)(Nb,Ti)4(Si4O12)2(O,OH)4•6(H2O) C 2/m 2/m

09.CE.30c Karupmollerite-Ca! (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4•7(H2O) C 2/m 2/m

09.CE.30c Kuzmenkoite-Zn! K2Zn(Ti,Nb)4(Si4O12)2(OH,O)4•6-8(H2O) Cm m

09.CE.30c Kuzmenkoite-Mn! (K,Na)2(Mn,Fe)(Ti,Nb)4[Si4O12]2(OH)4•5(H2O) C 2/m 2/m

09.CE.30c Gjerdingenite-Fe! K2[(H2O)2(Fe,Mn)][(Nb,Ti)4(Si4O12)2(O,OH)4]•4(H2O) C 2/m 2/m

09.CE.30c Lepkhenelmite-Zn! Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O) Cm m

09.CE.30c Gjerdingenite-Ca! K2Ca(Nb,Ti)4(Si4O12)2(O,OH)4•6H2O C 2/m 2/m

09.CE.30c Gjerdingenite-Na! (K,Na)2Na(Nb,Ti)4(Si4O12)2(OH,O)4•5H2O C 2/m 2/m

09.CE.30c Burovaite-Ca! (K,Na)4Ca2(Ti,Nb)8[Si4O12]4(OH,O)8•12H2O C 2/m 2/m

Other Lepkhenelmite-Zn Information

References:

NAME( CanMin, 42:1913) PHYS. PROP.(CanMin, 42:1913) OPTIC PROP.(CanMin, 42:1913)

See Also:

Links to other databases for Lepkhenelmite-Zn :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Lepkhenelmite-Zn using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Lepkhenelmite-Zn :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Lepkhenelmite-Zn Mineral Data :

Ask about Lepkhenelmite-Zn here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Lepkhenelmite-Zn Specimen Label here :

Lepkhenelmite-Zn

Ba2Zn(Ti,Nb)4(Si4O12)2(O,OH)4•7(H2O)
Dana No: 60.01.03c.04 Strunz No: 09.CE.30c
Locality:

Notes: