Crandallite Mineral Data

General Crandallite Information

Chemical Formula:

CaAl3(PO4)2(OH)5•(H2O)

Composition:

Molecular Weight = 414.02 gm

Calcium 9.68 % Ca 13.54 % CaO

Aluminum 19.55 % Al 36.94 % Al₂O₃

Phosphorus 14.96 % P 34.28 % P₂O₅

Hydrogen 1.70 % H 15.23 % H₂O

Oxygen 54.10 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaAl₃(PO₄)₂(OH)₅•(H₂O)

Environment:

Lateritic phosphate deposits and alteration of pegmatitic phosphate minerals.

IMA Status:

Valid Species (Pre-IMA) 1917

Locality:

Brooklyn mine, near Silver City, Tintic district, Juab County, Utah, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Milan L. Crandall, Jr., engineer, Knight Syndicate, Provo, Utah, USA.

Name Pronunciation:

Crandallite + Pronunciation

Synonym:

Davisonite - mixture with apatite

Deltaite - mixture with hydroxylapatite

Dennisonite - Mixture with apatite

Crandallite Image

Images:

Crandallite Wardite

Comments: Sliced and polished slab of yellow to white mixture of wardite and crandallite.
Location: Clay Canyon, Fairfield, Utah Co., Utah, USA. Scale: 11x6x.6 cm.
© John Betts - Fine Minerals

Images:

Phosphofibrite Crandallite

Comments: Olive-green colored fibrous phosphofibrite aggregates with white crandallite.
Location: Silver Coin Mine, Humboldt County, Nevada, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Crandallite Crystallography

Axial Ratios:

a:c = 1:2.31149

Cell Dimensions:

a = 7.005, c = 16.192, Z = 3; V = 688.09 Den(Calc)= 3.00

Crystal System:

Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 2.97(1), 2.18(0.45), 5.75(0.35),

Physical Properties of Crandallite

Cleavage:

{0001} Perfect

Color:

Gray, Yellow, Yellowish white, Light red.

Density:

2.78 - 2.92, Average = 2.84

Diaphaneity:

Transparent to Subtranslucent

Habit:

Compact - Occurs as a compact mass.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

4 - Fluorite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Dull

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Crandallite

Gladstone-Dale:

CI meas= 0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.057 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2068,KPDmeas= 0.2177,KC= 0.2194
Ncalc = 1.61 - 1.66

Optical Data:

Uniaxial (+), w=1.618, e=1.623, bire=0.0050.

Calculated Properties of Crandallite

Electron Density:

Bulk Density (Electron Density)=2.86 gm/cc
note: Specific Gravity of Crandallite =2.85 gm/cc.

Fermion Index:

Fermion Index = 0.0003929295
Boson Index = 0.9996070705

Photoelectric:

PE_Crandallite= 2.50 barns/electron
U=PE_Crandallite x rElectron Density= 7.15 barns/cc.

Radioactivity:

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

Crandallite Classification

Dana Class:

42.07.03.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.07)where (AB)5 (XO4)3 Zq ï¿½ x(H2O)

(42.07.03)Crandallite Group

42.07.03.01 Crandallite CaAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

42.07.03.02 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 R 3m 3 2/m

42.07.03.03 Goyazite SrAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

42.07.03.04 Lusungite? (Sr,Pb)Fe3(PO4)2(OH)5•(H2O) R 3m 3m

42.07.03.05 Plumbogummite PbAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

42.07.03.06 Kintoreite PbFe3(PO4)2(OH,H2O)6 R 3m 3 2/m

42.07.03.07 Benauite! HSrFe3(PO4)2(OH)6 R 3m 3 2/m

42.07.03.08 Springcreekite! BaV3(PO4)2(OH,H2O)6 R 3m 3 2/m

Strunz Class:

08.BL.10 08 - PHOSPHATES, ARSENATES, VANADATES

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

08.BL -With medium-sized and large cations, (OH, etc.):RO4 = 3:1

08.BL.10 Arsenogorceixite! BaAl3AsO3(OH)(AsO4,PO4)(OH,F)6 R 3m 3 2/m

08.BL.10 Arsenocrandallite (Ca,Sr)Al3[(As,P)O4]2(OH)5•(H2O) R 3m 3m

08.BL.10 Ferrazite? (Pb,Ba)3(PO4)2•8(H2O)(?) Tri

08.BL.10 Arsenowaylandite* BiAl3(AsO4)2(OH)6 R 3m 3 2/m

08.BL.10 Benauite! HSrFe3(PO4)2(OH)6 R 3m 3 2/m

08.BL.10 Arsenogoyazite (Sr,Ca,Ba)Al3(AsO4,PO4)2(OH,F)5•(H2O) R 3m 3 2/m

08.BL.10 Dussertite BaFe3(AsO4)2(OH)5 R 3m 3m

08.BL.10 Crandallite CaAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

08.BL.10 Goyazite SrAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

08.BL.10 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 R 3m 3 2/m

08.BL.10 Kintoreite PbFe3(PO4)2(OH,H2O)6 R 3m 3 2/m

08.BL.10 Lusungite? (Sr,Pb)Fe3(PO4)2(OH)5•(H2O) R 3m 3m

08.BL.10 Philipsbornite PbAl3(AsO4)2(OH)5•(H2O) R 3m-,R 3m Trig

08.BL.10 Plumbogummite PbAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

08.BL.10 Segnitite PbFe3H(AsO4)2(OH)6 R 3m 3 2/m

08.BL.10 Springcreekite! BaV3(PO4)2(OH,H2O)6 R 3m 3 2/m

Other Crandallite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Crandallite :
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 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Crandallite

CaAl3(PO4)2(OH)5•(H2O)
Dana No: 42.07.03.01 Strunz No: 08.BL.10
Locality:

Notes:

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