Hurlbutite Mineral Data

Hurlbutite Mineral Data +

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General Hurlbutite Information

Chemical Formula:

CaBe2(PO4)2

Composition:

Molecular Weight = 248.05 gm

Calcium 16.16 % Ca 22.61 % CaO

Beryllium 7.27 % Be 20.17 % BeO

Phosphorus 24.97 % P 57.23 % P₂O₅

Oxygen 51.60 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaBe₂(PO₄)₂

IMA Status:

Valid Species (Pre-IMA) 1952

Locality:

G. E. Smith mine, Newport, Sullivan County, New Hampshire, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Cornelius S. Hurlbut, Jr. (1906-), professor of mineralogy, Harvard University, Cambridge.

Synonym:

ICSD 6189

PDF 34-1441

Hurlbutite Image

Images:

Hurlbutite Roscherite

Comments: White, round crystal clusters of hurlbutite on reddish brown roscherite.
Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Hurlbutite Crystallography

Axial Ratios:

a:b:c =0.945:1:0.8879

Cell Dimensions:

a = 8.299, b = 8.782, c = 7.798, Z = 4; beta = 90.5° V = 568.31 Den(Calc)= 2.90

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

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

By Intensity(I/I_o): 3.67(1), 2.78(0.9), 3.03(0.9),

Crystal Structure:

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Lindbloom J T , Gibbs G V , Ribbe P H , American Mineralogist , 59 (1974) p.1267-1271, The crystal structure of hurlbutite: A comparison with danburite and anorthite

Physical Properties of Hurlbutite

Cleavage:

None

Color:

Colorless, Greenish white, Yellow.

Density:

2.877

Diaphaniety:

Transparent to Translucent

Fracture:

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

Habit:

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

Hardness:

6 - Orthoclase

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Hurlbutite

Gladstone-Dale:

CI meas= -0.04 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2069,KPDmeas= 0.2086,KC= 0.2006

Optical Data:

Biaxial (-), a=1.595, b=1.601, g=1.604, bire=0.0090, 2V(Calc)=70, 2V(Meas)=70. Dispersion r > v weak.

Calculated Properties of Hurlbutite

Electron Density:

r_electron=2.85 gm/cc
note: r_Hurlbutite=2.90 gm/cc.

Fermion Index

Fermion Index = 0.07313
Boson Index = 0.92687

Photoelectric:

PE_Hurlbutite= 3.27 barns/electron
U=PE_Hurlbutite x r_electron= 9.32 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hurlbutite is Not Radioactive

Hurlbutite Classification

Dana Class:

38.3.6.1 (38)Anhydrous Phosphates, etc

(38.3)(A+ B++)3 (XO4)2

(38.3.6)Dana Group

38.3.6.1 Hurlbutite CaBe2(PO4)2 P 2₁/a 2/m

Strunz Class:

VII/A.01-40 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of small size: Li, Be, Al

VII/A.01 - Berlinite - Beryllonite - Hurlbutite series

VII/A.01-10 Berlinite AlPO4 P 3₁21,P 3₂21 3 2

VII/A.01-12 Alarsite! AlAsO4 P 3₁21,P 3₂21 3 2

VII/A.01-15 Rodolicoite! FePO4 R 3121 3 2

VII/A.01-20 Lithiophosphate Li3PO4 P mn2₁ mm2

VII/A.01-25 Nalipoite NaLi2PO4 Pmnb 2/m 2/m 2/m

VII/A.01-30 Beryllonite NaBePO4 P 2₁/n 2/m

VII/A.01-40 Hurlbutite CaBe2(PO4)2 P 2₁/a 2/m

Other Hurlbutite Information

References:

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

See Also:

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

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

Hurlbutite

CaBe2(PO4)2
Dana No: 38.3.6.1 Strunz No: VII/A.01-40
Locality:

Notes: