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Clinometaborite

Collectors Summary

Color farblos
wird an der Luft innerhalb einiger Monate kreideweiß
Lustre Glasglanz
Cleavages vollkommen
Solubility +++ H2O
Crystal System monoklin, P21/a

Chemism

Chemical formula

HBO2

Additional chem. information

Dimorph mit Metaborit; synthetische Phase und Struktur bekannt

Chemical composition

Bor, Sauerstoff, Wasserstoff

Unit weight: 43.818507 u; Number of atoms in the formula: 4

Info

Empirical formula:

HBO2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

2.30

1

25.00

1.0079470

1.0079470
Boron

B

24.67

1

25.00

10.8117000

10.8117000
Oxygen

O

73.03

2

50.00

15.9994300

31.9988600

Analysis wt%

B2O3 : 79.44, H2O : 20.56 (Ref: berechnet)

Strunz 9th edition incl. updates

6.BA.10

6: Borate
B: Diborate
A: Insel (Neso)-Diborate mit Doppel-Triangeln B2(O,OH)5;2(2Δ); 2(2Δ) + OH, etc.
10:Szaibelyit-Gruppe

Lapis Classification

V/L.01-020

V: NITRATE, CARBONATE UND BORATE
L: Gerüstborate mit [BO2] 1- bis [B12O24] 12-

Classification by Hölzel

6.GA.610

6: Borates
G: Heptaborates and further megaborates
A:
6: Tektoborates -8(8T)

IMA status

anerkannt - CNMNC Newsletter, August 2010

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos
wird an der Luft innerhalb einiger Monate kreideweiß

Diaphaneity (Transparency)

durchscheinend

Lustre

Glasglanz

max. Birefringence

0.154
Birefringence chart\! Clinometaborite title=Birefringence chart Clinometaborite

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

1.434

RI value β

1.570

RI value γ / ε

1.588

Ri mean

1.531

2V angle

Biaxial (-)

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/a

Cell parameters a (Å)

7.124

Cell parameters b (Å)

8.847

Cell parameters c (Å)

6.770

Cell parameters a/b or c/a

0.805

Cell parameters c/b

0.765

Cell parameters α

90°

Cell parameters β

93.23

Cell parameters γ

90°

Z

12

Volume (ų)

426.008

X-Ray Powder Diffraction

6.752(165), 3.552(60), 3.219(57), 3.179(144), 3.074(1000), 1.848(42), 1.818(23), 1.695(35)
XRD chart Clinometaborite

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

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

2.049 ber.

2.049 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen

Tenacity

spröde

Instability

+++ H2O

(Co-)Type locality

(Co-)Type locality

Italien/Sizilien (Sicilia), Region/Messina, Provinz/Äolische (Liparische) Inseln (Isole Eolie; Isole Lipari)/Vulcano, Insel/La Fossa Krater

Type material

Referenz Sammlung der DCSSI, Universität von Mailand

Collection number of type material

2010-01

Paragenesis of type material

Metaborit, Sassolin, Adranosit

Preface

Author (Name, Year)

Demartin, F., Gramaccioli, C.M., Campostrini, I. (2011)

References

Francesco Demartin, Carlo Maria Gramaccioli, Italo Campostrini: Clinometaborite, natural β-metaboric acid, from La Fossa Crater, Vulcano, Aeolian Islands, Italy. Can. Mineral. 49 (2011) S.1273-1279.

Campostrini, I., Demartin, F. and Gramaccioli, C.M. (2010) Clinometaborite, IMA 2010-022. CNMNC Newsletter, August 2010, page 799; Mineralogical Magazine, 74, 797-800.

Dmitriy Belakovskiy, Fernando Cámara, G. Diego Gatta: New Mineral Names. American Mineralogist Vol. 99 (2014) S. 870-875.

Other languages

English

Clinometaborite

German

Klinometaborit

Alternative Name

German

Clinometaborit

CNMNC (IMA)-Number

IMA 2010-022

CNMNC symbol

Symbol

Cmbo

Locations with GPS information

IDs

GUSID (Global unique identifier short form) JTf0LLe0CUaIX1CaEt3Wnw
GUID (Global unique identifier) 2CF43725-B4B7-4609-885F-509A12DDD69F
Database ID 6939