Mineralogy Database

Lorenzenite Mineral Data

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General Lorenzenite Information

Help on Chemical  Formula: Chemical Formula: Na2Ti2Si2O9
Help on Composition: Composition: Molecular Weight = 341.91 gm
   Sodium    13.45 %  Na   18.13 % Na2O
   Titanium  28.01 %  Ti   46.73 % TiO2
   Silicon   16.43 %  Si   35.15 % SiO2
   Oxygen    42.12 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2Ti2Si2O9
Help on Environment: Environment: Alkaline magmatic and pegmatitic rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1897
Help on Locality: Locality: Narssarsuag, Julianehaab, Greenland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Johannes Theodor Lorenzen (1855-1884), Danish mineralogist and student of Greenland minerals.
Help on Name Pronunciation: Name Pronunciation: Lorenzenite + Pronunciation Say LORENZENITE
Help on Synonym: Synonym: Ramsayite

Lorenzenite Image

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  Lorenzenite   Orthoclase

Comments: Striated, dark violet crystal of lorenzenite in cream-colored orthoclase.
Location: Khibiny Massif, Kola Peninsula, Russia. Scale: 1.3 x 1.2 cm.
© John Veevaert

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  Vuonnemite   Lorenzenite

Comments: Square vuonnemite crystal with brown, lorenzenite crystals in syenite rock.
Location: Ilimaussaq, Greenland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Lorenzenite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.665:1:2.7685
Help on Cell Dimensions: Cell Dimensions: a = 8.7128, b = 5.2327, c = 14.487, Z = 4; V = 660.48 Den(Calc)= 3.44
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P bcn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.749(1), 3.345(0.9), 5.57(0.35),

Physical Properties of Lorenzenite

Help on Cleavage: Cleavage: {100} Distinct, {110} Distinct
Help on Color: Color: Brown, Colorless, Green, White, Light blue.
Help on Density: Density: 3.4
Help on Diaphaneity: Diaphaneity: Transparent to translucent to opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Massive - Fibrous - Distinctly fibrous fine-grained forms.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luminescence: Luminescence: Fluorescent, Short UV=cream pale yellow.
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: light brownish yellow

Optical Properties of Lorenzenite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2859,KPDmeas= 0.2892,KC= 0.2912
Ncalc = 1.99 - 2
Help on Optical Data: Optical Data: Biaxial (-), a=1.92, b=2.01, g=2.02, bire=0.1000, 2V(Calc)=34, 2V(Meas)=38-40. Dispersion none.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.

Calculated Properties of Lorenzenite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.30 gm/cc
note: Specific Gravity of Lorenzenite =3.40 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PELorenzenite = 5.45 barns/electron
U=PELorenzenite x rElectron Density= 18.00 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lorenzenite is Not Radioactive

Lorenzenite Classification

Help on  Dana Class: Dana Class: (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.01)with chains P=2
  (65.01.06)Lorenzenite group Lorenzenite Na2Ti2Si2O9 P bcn 2/m 2/m 2/m Kukisvumite Na6ZnTi4Si8O28•4(H2O) Pccn 2/m 2/m 2/m Lintisite Na3LiTi2Si4O14•2(H2O) C 2/c 2/m Manganokukisvumite! Na6MnTi4Si8O28•4(H2O) Pccn 2/m 2/m 2/m Punkaruaivite! Li{Ti2(OH)2[Si4O11(OH)]}•H2O C 2/c 2/m
Help on  Strunz Class: Strunz Class: 09.DB.10 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DB -Inosilicates with 2-periodic single chains, Si2O6; Pyroxene-related minerals
09.DB.10 Lorenzenite Na2Ti2Si2O9 P bcn 2/m 2/m 2/m

Other Lorenzenite Information

Help on See Also: See Also: Links to other databases for Lorenzenite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info

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Dana No: Strunz No: 09.DB.10





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