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Alforsite

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 5
Crystal System hexagonal, P63/m

Chemism

Chemical formula

Ba5(PO4)3Cl

Chemical composition

Barium, Chlor, Phosphor, Sauerstoff

Unit weight: 1007.0061436 u; Number of atoms in the formula: 21

Info

Empirical formula:

Ba5(PO4)3Cl

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

19.07

12

57.14

15.9994300

191.9931600
Phosphorus

P

9.23

3

14.29

30.9737612

92.9212836
Chlorine

Cl

3.52

1

4.76

35.4532000

35.4532000
Barium

Ba

68.19

5

23.81

137.3277000

686.6385000

Strunz 9th edition incl. updates

8.BN.05

8: Phosphate, Arsenate, Vanadate
B: Phosphate, etc., mit weitere Anionen, ohne H2O
N: Mit ausschließlich [Kationen] (OH, etc.):RO4 = 0.33:1
05:Apatit-Gruppe

Lapis Classification

VII/B.39-120

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
B: Wasserfreie Phosphate, mit fremden Anionen F,Cl,O,OH
39: Mittelgroße und große Kationen: Mg-Cu-Zn und Ca-Na-K-Ba-Pb; Apatit-Gruppe

Classification by Hölzel

8.BO.130

8: PHOSPHATES ARSENATES VANADATES
B: Phosphates (+Anions -Water)
O: Apatite Supergroup
1: Apatites with Ca,Sr,Ba

Dana 8th edition

41.08.05.02

41: Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
08: Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen where (A)5 (XO4)3 Zq
05: Morelandite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Apatite Supergroup  ⇒ Apatite group

Optical Properties

Color

farblos

Streak color

weiß

max. Birefringence

0.002
Birefringence chart\! Alforsite title=Birefringence chart Alforsite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.696

RI value γ / ε

1.694

Ri mean

1.695

2V angle

Uniaxial (-)

Crystallography

Crystal System

hexagonal

Class (H-M)

6/m

Space Group number

176

Space Group

P63/m

Cell parameters a (Å)

10.25

Cell parameters b (Å)

-

Cell parameters c (Å)

7.64

Cell parameters a/b or c/a

0.745

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

2

Volume (ų)

695.139

X-Ray Powder Diffraction

3.06(100),
2.13(40),
2.03(30),
1.928(30),
1.566(30),
1.336(30),
1.077(30),
1.067(30)
XRD chart Alforsite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5

VHN (Hardness Vickers)

390 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

4.77 (berechnet)

4.811 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

USA/Kalifornien (California)/Fresno Co./Big Creek/Esquire No. 7 Claim

Preface

Author (Name, Year)

Newberry & Essene & Peacor 1981

References

American Mineralogist 66 (1981), 1050

IMA group assignments

Other languages

German

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Spanish

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English

Alforsite

French

Alforsite

Russian

Алфорсит

Traditional Chinese

氯磷鋇石

Simplified Chinese

氯磷钡石

CNMNC (IMA)-Number

IMA 1980-039

CNMNC symbol

Symbol

Afr

Locations with GPS information

IDs

GUSID (Global unique identifier short form) NlThLNMQgEq1FiOSyV3R7g
GUID (Global unique identifier) 2CE15436-10D3-4A80-B516-2392C95DD1EE
Database ID 55