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Additional Functions

Collectors Summary

Color farblos
Streak color weiß
Hardness (Mohs) 2.00 - 3.00
Crystal System hexagonal, P6

Chemism

Chemical formula

Na7Ca3(SO4)6(OH)·H2O

Chemical composition

Calcium, Natrium, Sauerstoff, Schwefel, Wasserstoff

Unit weight: 892.5656124 u; Number of atoms in the formula: 45

Info

Empirical formula:

Na7Ca3(SO4)6(OH)·H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.34

3

6.67

1.0079470

3.0238410
Oxygen

O

46.61

26

57.78

15.9994300

415.9851800
Sodium

Na

18.03

7

15.56

22.9897702

160.9283914
Sulfur

S

21.56

6

13.33

32.0655000

192.3930000
Calcium

Ca

13.47

3

6.67

40.0784000

120.2352000

Analysis wt%

CaO : 18.80, SrO : 0.72, Na2O : 23.30, SO3 : 52.60, Cl : 0.44, H2O : 2.91 (Ref: Mineralogical Magazine 81)

Strunz 9th edition incl. updates

7.BD.20

7: Sulfate (Selenate, Tellurate, Chromate, Molybdate, Wolframate)
B: Sulfate (Selenate, etc.) mit weitere Anionen, ohne H2O
D: Mit ausschließlich großen [Kationen]
20:Cesanit-Gruppe

Lapis Classification

VI/B.12-050

VI: SULFATE, CHROMATE, MOLYBDATE UND WOLFRAMATE
B: Wasserfreie Sulfate, mit fremden Anionen
12: Große Kationen vorwiegend

Classification by Hölzel

8.BO.530

8: PHOSPHATES ARSENATES VANADATES
B: Phosphates (+Anions -Water)
O: Apatite Supergroup
5: Hedyphanes with ~[SO4]

Dana 8th edition

30.03.03.01

30: Anhydrous Sulfates Containing Hydroxyl or Halogen
03: Anhydrous Sulfates Containing Hydroxyl or Halogen with miscellaneous formulae

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Apatite Supergroup  ⇒ Hedyphane group

Optical Properties

Color

farblos

Streak color

weiß

max. Birefringence

0.006
Birefringence chart\! Cesanite title=Birefringence chart Cesanite

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

1.570

RI value γ / ε

1.564

Ri mean

1.568

2V angle

Uniaxial (-)

Crystallography

Crystal System

hexagonal

Class (H-M)

3m

Space Group number

174

Space Group

P6

Cell parameters a (Å)

9.463

Cell parameters b (Å)

-

Cell parameters c (Å)

6.909

Cell parameters a/b or c/a

0.73

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

1

Volumne (ų)

535.801

X-Ray Powder Diffraction

4.720(50),
3.896(70),
3.448(90),
2.822(60),
2.727(100),
2.636(50),
2.269(50),
1.844(70)
XRD chart Cesanite

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)

2.00 - 3.00

VHN (Hardness Vickers)

53 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.786 (gemessen)

2.766 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Italien/Latium (Lazio), Region/Rom, Provinz/Bracciano See/Cesano Geothermal-Feld

Preface

Author (Name, Year)

Cavarretta & Mottana & Tecce, 1981

References

American Mineralogist 87 (2002), 715

IMA group assignments

Other languages

German

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Spanish

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French

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English

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Russian

Чезанит

CNMNC (IMA)-Number

IMA 1980-023

CNMNC symbol

Symbol

Csa