Luneburgite Mineral Data

General Luneburgite Information

Chemical Formula:

Mg3B2(PO4)2(OH)6•5(H2O)

Composition:

Molecular Weight = 476.60 gm

Magnesium 15.30 % Mg 25.37 % MgO

Boron 4.54 % B 14.61 % B₂O₃

Phosphorus 13.00 % P 29.78 % P₂O₅

Hydrogen 3.38 % H 30.24 % H₂O

Oxygen 63.78 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₃B₂(PO₄)₂(OH)₆•5(H₂O)

Environment:

In marine evaporite sequences.

IMA Status:

Valid Species (Pre-IMA) 1870

Locality:

Liineburg, 40 km south-southeast of Hannover, Lower Saxony, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Luneburgite + Pronunciation

Synonym:

Lueneburgite

Luneburgite Crystallography

Axial Ratios:

a:b:c =0.6475:1:0.6424

Cell Dimensions:

a = 6.3475, b = 9.8027, c = 6.2976, Z = 1; alpha = 84.86°, beta = 106.4°, gamma = 96.4° V = 372.07 Den(Calc)= 2.13

Crystal System:

Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1

Physical Properties of Luneburgite

Color:

White, Brownish white, Green, Colorless.

Density:

2.05

Diaphaneity:

Transparent to Translucent

Hardness:

2 - Gypsum

Luster:

Vitreous (Glassy)

Optical Properties of Luneburgite

Gladstone-Dale:

CI meas= -0.092 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.056 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2528,KPDmeas= 0.2615,KC= 0.2395
Ncalc = 1.49 - 1.51

Optical Data:

Biaxial (-), a=1.52-1.522, b=1.54-1.541, g=1.545-1.548, bire=0.0250-0.0260, 2V(Calc)=52-60, 2V(Meas)=63.

Calculated Properties of Luneburgite

Electron Density:

Bulk Density (Electron Density)=2.17 gm/cc
note: Specific Gravity of Luneburgite =2.12 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Luneburgite= 1.09 barns/electron
U=PE_Luneburgite x rElectron Density= 2.37 barns/cc.

Radioactivity:

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

Luneburgite Classification

Dana Class:

43.05.11.01 (43)Compound Phosphates, etc.

(43.05)(Hydrated Compound Anions With Hydroxyl or Halogen)

(43.05.11)Dana Group

43.05.11.01 Luneburgite Mg3B2(PO4)2(OH)6•5(H2O) P1 1

Strunz Class:

06.AC.60 06 - BORATES

06.A - Monoborates

06.AC -B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc.

06.AC.60 Luneburgite Mg3B2(PO4)2(OH)6•5(H2O) P1 1

Other Luneburgite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Luneburgite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST

Search for Luneburgite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Luneburgite :

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.

Ask about Luneburgite 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 Luneburgite Specimen Label here :

Luneburgite

Mg3B2(PO4)2(OH)6•5(H2O)
Dana No: 43.05.11.01 Strunz No: 06.AC.60
Locality:

Notes: