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Penobsquisite

Additional Functions

Collectors Summary

Color blassgelb
Streak color weiß
Hardness (Mohs) 3
Cleavages keine
Fracture muschelig
Crystal System monoklin, P21

Chemism

Chemical formula

Ca2(Fe2+,Mg)[Cl|B9O13(OH)6]·4H2O

Chemical composition

Calcium, Chlor, Eisen, Magnesium, Bor, Sauerstoff, Wasserstoff

Unit weight: 642.973613 u; Number of atoms in the formula: 50

Info

Empirical formula:

Ca2(Fe0.75Mg0.25)[ClB9O13(OH)6]·4H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

2.19

14

28.00

1.0079470

14.1112580

Boron

B

15.13

9

18.00

10.8117000

97.3053000

Oxygen

O

57.23

23

46.00

15.9994300

367.9868900

Magnesium

Mg

0.95

0.25

0.50

24.3050600

6.0762650

Chlorine

Cl

5.51

1

2.00

35.4532000

35.4532000

Calcium

Ca

12.47

2

4.00

40.0784000

80.1568000

Iron

Fe

6.51

0.75

1.50

55.8452000

41.8839000

Analysis wt%

Ø CaO : 17.27, FeO : 7.48, MgO : 1.82, Cl : 5.77, B2O3 : 48.50, H2O : 19.52 (Ref: Canadian Mineralogist 96)

Strunz 9th edition incl. updates

6.GB.10

6: Borate
G: Heptaborate und andere Megaborate
B:
10:Penobsquisit-Gruppe

Lapis Classification

V/K.09-030

V: NITRATE, CARBONATE UND BORATE
K: Schichtborate mit komplexen Baugruppen [Bx(O,OH)y]

Classification by Hölzel

6.GA.230

6: Borates
G: Heptaborates and further megaborates
A:
2: Phyllo-nonaborates - 9(4P+5T)

Dana 8th edition

26.05.17.04

26: Hydrated Borates Containing Hydroxyl or Halogen
05: Hydrated Borates Containing Hydroxyl or Halogen
17: Pringleite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

blassgelb

Streak color

weiß

max. Birefringence

0.042

Birefringence chart\! Penobsquisite title=Birefringence chart Penobsquisite

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

1.550

RI value β

1.554

RI value γ / ε

1.592

Ri mean

1.565

2V angle

Biaxial (+) 33°

Crystallography

Crystal System

monoklin

Class (H-M)

2

Space Group number

4

Space Group

P21

Cell parameters a (Å)

11.63

Cell parameters b (Å)

9.38

Cell parameters c (Å)

8.735

Cell parameters a/b or c/a

1.240

Cell parameters c/b

0.931

Cell parameters α

90°

Cell parameters β

98.40

Cell parameters γ

90°

Z

2

Volume (ų)

942.674

X-Ray Powder Diffraction

8.65(30),
7.29(100),
6.37(10),
5.32(20),
4.50(20),
2.958(30),
2.744(20),
2.113(30)

XRD chart Penobsquisite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

3

VHN (Hardness Vickers)

83 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.26 (gemessen)

2.265 ( ρ calc. Mineralienatlas )

Cleavages

keine

Fracture

muschelig

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Kanada/New Brunswick/Kings Co./Sussex/Penobsquis

Preface

Author (Name, Year)

Grice & Gault & Van Velthuizen, 1996

References

Canadian Mineralogist 34 (1996), 657

Other languages

German

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Spanish

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English

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French

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Russian

Пенобсквисит

CNMNC (IMA)-Number

IMA 1995-014

CNMNC symbol

Symbol

Pnb

IDs

GUSID (Global unique identifier short form) cuVjkpBpvUeQoDHJQjK9PA
GUID (Global unique identifier) 9263E572-6990-47BD-90A0-31C94232BD3C
Database ID 2983