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Buchwaldite

Collectors Summary

Color weiß
Streak color weiß
Hardness (Mohs) 2.75
Crystal System orthorhombisch, Pn21a

Chemism

Chemical formula

NaCaPO4

Chemical composition

Calcium, Natrium, Phosphor, Sauerstoff

Unit weight: 158.0396514 u; Number of atoms in the formula: 7

Info

Empirical formula:

NaCaPO4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

40.49

4

57.14

15.9994300

63.9977200

Sodium

Na

14.55

1

14.29

22.9897702

22.9897702

Phosphorus

P

19.60

1

14.29

30.9737612

30.9737612

Calcium

Ca

25.36

1

14.29

40.0784000

40.0784000

Analysis wt%

P2O5 : 44.90, CaO : 35.60, Na2O : 19.50 (Ref: American Mineralogist 77)

Strunz 9th edition incl. updates

8.AD.25

8: Phosphate, Arsenate, Vanadate
A: Phosphate, etc., ohne weitere Anionen, ohne H2O
D: Mit ausschließlich großen [Kationen]
25:Xenotim-Gruppe

Lapis Classification

VII/A.12-055

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
A: Wasserfreie Phosphate [PO4] 3-, ohne fremde Anionen
12: Sehr große Kationen: Ca-Na-K, SE, Bi u.a.

Classification by Hölzel

8.AD.300

8: PHOSPHATES ARSENATES VANADATES
A: Phosphates (-anions -water)
D: Phosphates, C large

Dana 8th edition

38.01.02.02

38: Anhydrous Phosphates, etc
01: Anhydrous Phosphates, etc A+ B++ XO4

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

weiß

Streak color

weiß

max. Birefringence

0.009

Birefringence chart\! Buchwaldite title=Birefringence chart Buchwaldite

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

1.607

RI value β

1.610

RI value γ / ε

1.616

Ri mean

1.611

2V angle

Biaxial (-) 65°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mm2

Space Group number

33

Space Group

Pn21a

Cell parameters a (Å)

20.397

Cell parameters b (Å)

5.412

Cell parameters c (Å)

9.161

Cell parameters a/b or c/a

3.769

Cell parameters c/b

1.693

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

12

Volume (ų)

1011.27

X-Ray Powder Diffraction

3.79(90),
2.72(100),
2.63(60),
2.58(50),
2.51(40),
2.19(40),
1.91(80),
1.54(30)

XRD chart Buchwaldite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

2.75

VHN (Hardness Vickers)

83 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.21

3.114 ( ρ calc. Mineralienatlas )

Preface

Author (Name, Year)

Olsen & Erlichman & Bunch & Moore, 1977

References

American Mineralogist 62 (1977), 362

Other languages

German

Buchwaldit

Spanish

Buchwaldita

English

Buchwaldite

French

Buchwaldite

Russian

Бухвальдит

Simplified Chinese

磷钠钙石

CNMNC (IMA)-Number

IMA 1975-041

CNMNC symbol

Symbol

Bwa

Locations with GPS information

IDs

GUSID (Global unique identifier short form) uKl6fyPFiUSO4AtatG44BA
GUID (Global unique identifier) 7F7AA9B8-C523-4489-8EE0-0B5AB46E3804
Database ID 515