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Cahnite

Pictures (7 Images total)

Borcarit, Cahnit
Views (Image: 1518422334): 973
Borcarit, Cahnit

Borcarit (grün) mit Cahnit (weißlich); Größe: 65x65x27 mm; Fundort: Huanggang Mines, Lagerstättenbezirk Huanggang-Sumugou, Hexigten-Banner (Keshiketeng), Präfektur Ulanhad Bund, Innere Mongolei, Ch...

Copyright: Rob Lavinsky
Contribution: slugslayer 2018-02-12
Locality: Huanggang / Huanggang-Sumugou, LS-Bezirk / Hexigten-Banner (Keshiketeng) / Chifeng, Stadt / Ulanhad Bund (Chifeng, Präf) / Innere Mongolei (Neimenggu) / China
Cahnit mit Rhodonit
Views (Image: 1277756452): 1400
Cahnit mit Rhodonit

Größe: 26x23 mm; Fundort: Franklin, Franklin Mining District, Sussex Co., New Jersey, USA

Copyright: Rock Currier
Contribution: slugslayer 2010-06-28
Locality: Franklin / Franklin Mining District / Sussex Co. / New Jersey / USA
Cahnit
Views (Image: 1353176448): 1217
Cahnit (SNr: A006555)

Oktaederförmige farblose Kristalle, BB = 1,5 mm, Fundort: Vallerano Steinbruch, Valleranello, Rom, Latium (Lazio), Region, Italien.

Collection: Lithothek der Münchener Micromounter
Copyright: Heribert Rotter
Contribution: Münchener Micromounter 2012-11-17
Locality: Vallerano Steinbruch / Valleranello / Rom / Latium (Lazio), Region / Italien
Borcarit, Cahnit
Views (Image: 1518422219): 816
Borcarit, Cahnit

Borcarit (grün) mit Cahnit (weißlich); Größe: 30x25x21 mm; Fundort: Huanggang Mines, Lagerstättenbezirk Huanggang-Sumugou, Hexigten-Banner (Keshiketeng), Präfektur Ulanhad Bund, Innere Mongolei, Ch...

Copyright: Rob Lavinsky
Contribution: slugslayer 2018-02-12
Locality: Huanggang / Huanggang-Sumugou, LS-Bezirk / Hexigten-Banner (Keshiketeng) / Chifeng, Stadt / Ulanhad Bund (Chifeng, Präf) / Innere Mongolei (Neimenggu) / China
Borcarit, Cahnit
Views (Image: 1518422264): 799
Borcarit, Cahnit

Borcarit (grün) mit Cahnit (weißlich); Größe: 46x34x19 mm; Fundort: Huanggang Mines, Lagerstättenbezirk Huanggang-Sumugou, Hexigten-Banner (Keshiketeng), Präfektur Ulanhad Bund, Innere Mongolei, Ch...

Copyright: Rob Lavinsky
Contribution: slugslayer 2018-02-12
Locality: Huanggang / Huanggang-Sumugou, LS-Bezirk / Hexigten-Banner (Keshiketeng) / Chifeng, Stadt / Ulanhad Bund (Chifeng, Präf) / Innere Mongolei (Neimenggu) / China
Borcarit, Cahnit
Views (Image: 1518422370): 251
Borcarit, Cahnit

Borcarit (grün) mit Cahnit (weißlich); Größe: 77x60x28 mm; Fundort: Huanggang Mines, Lagerstättenbezirk Huanggang-Sumugou, Hexigten-Banner (Keshiketeng), Präfektur Ulanhad Bund, Innere Mongolei, Ch...

Copyright: Rob Lavinsky
Contribution: slugslayer 2018-02-12
Locality: Huanggang / Huanggang-Sumugou, LS-Bezirk / Hexigten-Banner (Keshiketeng) / Chifeng, Stadt / Ulanhad Bund (Chifeng, Präf) / Innere Mongolei (Neimenggu) / China

Collectors Summary

Color farblos, weiß
Streak color weiß
Hardness (Mohs) 5
Solubility +++ Säuren
Crystal System tetragonal, I4

Chemism

Chem­ical formula

Ca2B(AsO4)(OH)4

Chem­ical com­po­si­tion

Arsen, Calcium, Bor, Sauerstoff, Wasserstoff

Unit weight: 297.91733 u; Number of atoms in the formula: 16

Info

Empirical formula:

Ca2B(AsO4)(OH)4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.35

4

25.00

1.0079470

4.0317880

Boron

B

3.63

1

6.25

10.8117000

10.8117000

Oxygen

O

42.96

8

50.00

15.9994300

127.9954400

Calcium

Ca

26.91

2

12.50

40.0784000

80.1568000

Arsenic

As

25.15

1

6.25

74.9216020

74.9216020

Anal­y­sis wt%

CaO : 37.62, B2O3 : 11.86, As2O5 : 38.05, H2O : 12.42 (Ref: American Mineralogist 27)

Strunz 9th edi­tion incl. updates

6.AC.70

6: Borate
A: Monoborate
C: B(O,OH)4, ohne und mit zusätzlichen [Anionen]; 1(T), 1(T)+OH, etc.
70:Cahnit-Gruppe

Lapis Clas­sifica­tion

V/G.08-030

V: NITRATE, CARBONATE UND BORATE
G: Inselborate
8: [BO4] 5-- und [B(OH)4] 1--Tetraeder

Clas­sifica­tion by Hölzel

6.AC.460

6: Borates
A: Monoborates
C:
4: Moydite-Cahnite-Group (with CO3, SO4, PO4, AsO4 - heterotypes)

Dana 8th edi­tion

43.04.04.01

43: Compound Phosphates, etc.
04: Compound Phosphates, etc. (Anhydrous Compound Anions With Hydroxyl or Halogen)

IMA sta­tus

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

farblos, weiß

Streak color

weiß

Diaphane­ity (Trans­parency)

transparent

max. Birefrin­gence

0.001

Birefringence chart\! Cahnite title=Birefringence chart Cahnite

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

1.662

RI value γ / ε

1.663

Ri mean

1.662

2V angle

Uniaxial (+)

Optical Data Luminescence

Color LW-UV (365nm)

 

gelblich weiß

LW-UV Intensity

schwach

Color SW-UV (254nm)

 

gelblich weiß

SW-UV Intensity

schwach

After­glow (Per­sistant Lumi­nes­cence)

keine Daten

Crystallography

Crystal Sys­tem

tetragonal

Class (H-M)

4

Space Group number

82

Space Group

I4

Cell param­e­ters a (Å)

7.095

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

6.190

Cell param­e­ters a/b or c/a

0.872

Cell param­e­ters c/b

-

Cell param­e­ters α

90°

Cell param­e­ters β

90°

Cell param­e­ters γ

90°

Z

2

Volumne (ų)

311.599

X-Ray Pow­der Diffrac­tion

5.02(20),
4.67(20),
3.56(100),
2.833(20),
2.640(50),
2.514(10),
2.336(20),
1.818(50)

XRD chart Cahnite

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)

5

VHN (Hard­ness Vick­ers)

413 (10g)

Density (g/cm³)

3.16

3.175 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+++ Säuren

Preface

Author (Name, Year)

Palache, 1921

References

Handbook of Mineralogy (Anthony et al.), 4 (2000), 89

Other languages

German

Cahnit

Spanish

Cahnita

English

Cahnite

French

Cahnite

Russian

Канит

Simplified Chinese

砷硼钙石

Alternative Name

Calcium Edingtonite

Japanese

カーン石

Simplified Chinese

水砷硼钙石

CNMNC symbol

Symbol

Cah

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Cahnit
Google-Bilder-Suche - search for: Cahnit
Mineralienatlas.de (Forum) - search for: Cahnit

English pages

Mindat - search for: Cahnite
Webmineral - search for:Cahnite
Handbook-of-Mineralogy - search for: Cahnite
RRUFF - Raman, XRD and other mineral data - search for: Cahnite
RRUFF - References and PDF downloads - search for: Cahnite
American-Mineralogist-Crystal-Structure-Database - search for: Cahnite
Strahlen.org - search for: Cahnite

Russian pages

Webmineral.ru - search for: Канит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Cahnit
Crystal-Treasure.com - search for: Cahnit
Bosse - search for: Cahnit
Edelsteine Neuburg - Gundolf Fischer - search for: Cahnit

Locations with GPS information