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Biachellaite

Additional Functions

Collectors Summary

Color farblos
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 5
Cleavages vollkommen (10-10), unvollkommen (teilbar?) (0001)
Crystal System trigonal, P3
Morphology Das Mineral bildet grobblockige Aggregate aus dipyramidal-pinakoidalen Kristallen bis zu 1 cm Größe. Die einzelnen Kristalle zeigen eine Tracht aus Basispinakoid {001} sowie hexagonalen Prismen und Pyramiden.

Chemism

Chemical formula

(Na,Ca,K)8(Si6Al6O24)(SO4)2(OH)0.5·H2O

Chemical composition

Aluminium, Calcium, Natrium, Silicium, Kalium, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 1170.85188666 u; Number of atoms in the formula: 58

Info

Empirical formula:

(Na0.6Ca0.3K0.1)8(Si6Al6O24)(SO4)2(OH)0.5·H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.22

2.5

4.31

1.0079470

2.5198675
Oxygen

O

45.78

33.5

57.76

15.9994300

535.9809050
Sodium

Na

9.42

4.8

8.28

22.9897702

110.3508970
Aluminium

Al

13.83

6

10.34

26.9815382

161.8892292
Silicon

Si

14.39

6

10.34

28.0855300

168.5131800
Sulfur

S

5.48

2

3.45

32.0655000

64.1310000
Potassium

K

2.67

0.8

1.38

39.0983100

31.2786480
Calcium

Ca

8.22

2.4

4.14

40.0784000

96.1881600

Analysis wt%

SiO2 : 31.46, SO3 : 12.71, Al2O3 : 26.17, CaO : 12.13, Na2O : 10.06, K2O : 5.85, Cl : 0.45, H2O : 1.60 (Ref: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva, 1904-1974 2008)

Strunz 9th edition incl. updates

9.FB.05

9: Silikate (Germanate)
F: Gerüstsilikate (Tektosilikate) ohne zeolithisches H2O
B: Gerüstsilikate (Tektosilicates) mit weiteren [Anionen]
05:Cancrinit-Gruppe

Lapis Classification

VIII/J.09-041

VIII: SILIKATE
J: Gerüstsilikate (mit Zeolithen)
9: Mit tetraederfremden Anionen; Cancrinit-Gruppe

Classification by Hölzel

9.FE.760

9: SILICATES
F: Tektosilicates
E: Hexagonal or trigonal with other Anions
7: Giuseppettite-Group - trigonal, axis a~~12A and c=n*~~5A, n>5

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

Diaphaneity (Transparency)

transparent

Lustre

Glasglanz

max. Birefringence

0.002
Birefringence chart\! Biachellaite title=Birefringence chart Biachellaite

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

1.512

RI value γ / ε

1.514

Ri mean

1.513

2V angle

Uniaxial (+)

Optical Data Luminescence

Luminescence

himbeerrote Fluoreszenz in kurzwelligen (γ = 245 nm) und rosafarbene Fluoreszenz im langwelligen (γ = 330 nm) UV-Licht

Crystallography

Crystal System

trigonal

Class (H-M)

3

Space Group number

143

Space Group

P3

Cell parameters a (Å)

12.913

Cell parameters b (Å)

-

Cell parameters c (Å)

79.605

Cell parameters a/b or c/a

6.165

Cell parameters c/b

-

Z

15

Volume (ų)

11495.432

X-Ray Powder Diffraction

11.07(19), 6.45(18), 4.782(15), 3.720(100), 3.576(18), 3.469(14), 3.300(47), 3.220(16)
XRD chart Biachellaite

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

Morphology

Das Mineral bildet grobblockige Aggregate aus dipyramidal-pinakoidalen Kristallen bis zu 1 cm Größe. Die einzelnen Kristalle zeigen eine Tracht aus Basispinakoid {001} sowie hexagonalen Prismen und Pyramiden.

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5

VHN (Hardness Vickers)

390 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.51 gem.

2.537 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen (10-10), unvollkommen (teilbar?) (0001)

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Italien/Latium (Lazio), Region/Rom, Provinz/Sacrofano/Sacrofano-Caldera/Biachella-Tal

Paragenesis of type material

Sanidin, Diopsid, Andradit, Leucit, Haüyn

Preface

Name from

Typlokalität

Author (Name, Year)

Nikita V. Chukanov, 2007

References

Neue Mineralien - IMA WEBseite Dez. 2007
Mineralien Welt 02/09, Steffen Jahn, Neue Mineralien

Other languages

German

Biachellait

Spanish

Biachellaita

English

Biachellaite

Russian

Бьякеллаит

CNMNC (IMA)-Number

IMA 2007-044

CNMNC symbol

Symbol

Bcl

IDs

GUSID (Global unique identifier short form) HXJQJ95k3EmByBn805rt3Q
GUID (Global unique identifier) 2750721D-64DE-49DC-81C8-19FCD39AEDDD
Database ID 4856