Natromontebrasite Mineral Data

[Newest Minerals] [Mineral Auctions] [Mineral Gallery]
The Mineral Gallery's Exceptional Specimens and Mineral Hall of Fame
Visa, PayPal, and Mastercard are Welcomed

General Natromontebrasite Information

Chemical Formula:

(Na,Li)Al(PO4)(OH,F)

Composition:

Molecular Weight = 158.44 gm

Sodium 10.88 % Na 14.67 % Na₂O

Lithium 1.10 % Li 2.36 % Li₂O

Aluminum 17.03 % Al 32.18 % Al₂O₃

Phosphorus 19.55 % P 44.80 % P₂O₅

Hydrogen 0.48 % H 4.26 % H₂O

Oxygen 47.97 % O

Fluorine 3.00 % F 3.00 % F

- % F -1.26 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na_0.75Li_0.25Al(PO₄)(OH)_0.75F_0.25

Environment:

Natromontebrasite (1913) has been shown to be a mixture of an OH-rich amblygonite and lacroixite, with subordinate quantities of wardite.

IMA Status:

Discredited IMA 2006

Locality:

Canyon City and Eight Mile Park, Fremont County, Colorado, USA. Link to MinDat.org Location Data.

Name Origin:

Named for the composition and resemblance to montebrasite.

Name Pronunciation:

Natromontebrasite + Pronunciation

Synonym:

Fremontite

Natromontebrasite Image

Images:

Natromontebrasite

Comments: Pale tan to orange natromontebrasite cleavages in quartz.
Location: Mica Load, Canon City, Fremont County, Colorado, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Natromontebrasite Crystallography

Axial Ratios:

a:b:c =0.7285:1:0.7074

Cell Dimensions:

a = 5.18, b = 7.11, c = 5.03, Z = 2; alpha = 111.035°, beta = 97.818°, gamma = 68.118° V = 158.96 Den(Calc)= 3.31

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

Forms: ( 3 3 2) ( 0 1 1) ( 1 2 0) ( 0 1 0) ( 0 2 1) ( 1 1 0) ( 1 0 0) ( 0 0 1)

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Physical Properties of Natromontebrasite

Cleavage:

{???} Distinct, {???} Distinct, {???} Distinct

Color:

White, Grayish white.

Density:

3.04

Diaphaneity:

Translucent to opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

5.5 - Knife Blade

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Natromontebrasite

Gladstone-Dale:

CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.077 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1841,KPDmeas= 0.1987,KC= 0.1996
Ncalc = 1.61 - 1.65

Optical Data:

Biaxial (+), a=1.594, b=1.603, g=1.615, bire=0.0210

Calculated Properties of Natromontebrasite

Electron Density:

Bulk Density (Electron Density)=2.99 gm/cc
note: Specific Gravity of Natromontebrasite =3.04 gm/cc.

Fermion Index:

Fermion Index = 0.0010523884
Boson Index = 0.9989476116

Photoelectric:

PE_{Natromontebrasite}= 1.64 barns/electron
U=PE_{Natromontebrasite} x rElectron Density= 4.90 barns/cc.

Radioactivity:

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

Natromontebrasite Classification

Dana Class:

41.05.08.03 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.05)where (A B)2 (XO4) Zq

(41.05.08)Amblygonite Group

41.05.08.01 Amblygonite (Li,Na)Al(PO4)(F,OH) P1 1

41.05.08.02 Montebrasite? LiAl(PO4)(OH,F) P1 1

41.05.08.03 Natromontebrasite? (Na,Li)Al(PO4)(OH,F) P1 1

Strunz Class:

08.BB.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BB -With only medium-sized cations, (OH, etc.):RO4 £ 1:1

08.BB.05 Amblygonite (Li,Na)Al(PO4)(F,OH) P1 1

08.BB.05 Natromontebrasite? (Na,Li)Al(PO4)(OH,F) P1 1

08.BB.05 Montebrasite? LiAl(PO4)(OH,F) P1 1

08.BB.05 Tavorite LiFe(PO4)(OH) P1 or P1 Tri

Other Natromontebrasite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

Search for Natromontebrasite using:

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

Visit our Advertisers for Natromontebrasite :

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 Natromontebrasite Mineral Data :

Ask about Natromontebrasite 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 Natromontebrasite Specimen Label here :

Natromontebrasite

(Na,Li)Al(PO4)(OH,F)
Dana No: 41.05.08.03 Strunz No: 08.BB.05
Locality:

Notes: