Lorenzenite Mineral Data

Lapis Mineral Journal

General Lorenzenite Information

Chemical Formula:

Na2Ti2Si2O9

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

Empirical Formula:

Na₂Ti₂Si₂O₉

Environment:

Alkaline magmatic and pegmatitic rocks.

IMA Status:

Valid Species (Pre-IMA) 1897

Locality:

Narssarsuag, Julianehaab, Greenland. Link to MinDat.org Location Data.

Name Origin:

Named for Johannes Theodor Lorenzen (1855-1884), Danish mineralogist and student of Greenland minerals.

Name Pronunciation:

Lorenzenite + Pronunciation

Synonym:

Ramsayite

Lorenzenite Image

Images:

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

Images:

Lorenzenite Vuonnemite

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

Axial Ratios:

a:b:c =1.665:1:2.7685

Cell Dimensions:

a = 8.7128, b = 5.2327, c = 14.487, Z = 4; V = 660.48 Den(Calc)= 3.44

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P bcn

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

By Intensity(I/I_o): 2.749(1), 3.345(0.9), 5.57(0.35),

Crystal Structure:

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Sundberg M R , Lehtinen M , Kivekas R , American Mineralogist , 72 (1987) p.173-177, Refinement of the crystal structure of ramsayite (lorenzenite)

Physical Properties of Lorenzenite

Cleavage:

{100} Distinct, {110} Distinct

Color:

Brown, Colorless, Green, White, Light blue.

Density:

3.4

Diaphaneity:

Transparent to translucent to opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Hardness:

6 - Orthoclase

Luminescence:

Fluorescent, Short UV=cream pale yellow.

Luster:

Vitreous - Greasy

Streak:

light brownish yellow

Optical Properties of Lorenzenite

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

Optical Data:

Biaxial (-), a=1.92, b=2.01, g=2.02, bire=0.1000, 2V(Calc)=34, 2V(Meas)=38-40. Dispersion none.

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Calculated Properties of Lorenzenite

Electron Density:

Bulk Density (Electron Density)=3.30 gm/cc
note: Specific Gravity of Lorenzenite =3.40 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Lorenzenite= 5.45 barns/electron
U=PE_Lorenzenite x rElectron Density= 18.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lorenzenite is Not Radioactive

Lorenzenite Classification

Dana Class:

65.01.06.01 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.01)with chains P=2

(65.01.06)Lorenzenite group

65.01.06.01 Lorenzenite Na2Ti2Si2O9 P bcn 2/m 2/m 2/m

65.01.06.02 Kukisvumite Na6ZnTi4Si8O28•4(H2O) Pccn 2/m 2/m 2/m

65.01.06.03 Lintisite Na3LiTi2Si4O14•2(H2O) C 2/c 2/m

65.01.06.04 Manganokukisvumite! Na6MnTi4Si8O28•4(H2O) Pccn 2/m 2/m 2/m

65.01.06.05 Punkaruaivite! Li{Ti2(OH)2[Si4O11(OH)]}•H2O C 2/c 2/m

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

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
18 - WWW-MINCRYST

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Print or Cut-and-Paste your Lorenzenite Specimen Label here :

Lorenzenite

Na2Ti2Si2O9
Dana No: 65.01.06.01 Strunz No: 09.DB.10
Locality:

Notes: