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Dachiardite-K

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Dachiardit-K
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Dachiardit-K

farbloses Aggregat von Dachiardit-K auf Trägermaterial, Austa, Momchilgrad, Kardschali, Bulgarien; BB < 1 mm, analysiert

Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2021-05-20
Locality: Momtschilgrad (Momchilgrad), Obshtina / Kardschali (Кърджалийска) Oblast / Bulgarien

Collectors Summary

Color weiß, farblos
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 4
Cleavages vollkommen
Fracture spröd
Crystal System monoklin, C2/m, Cm, C2

Chemism

Chem­ical formula

K4(Si20Al4O48)·13H2O

Empir­ical formula (anal­y­sis)

H26.23K1.71Ca1.04Ba0.05Al3.64Si20.24O61

Chem­ical com­po­si­tion

Aluminium, Silicium, Kalium, Sauerstoff, Wasserstoff

Unit weight: 1784.473637158 u; Number of atoms in the formula: 113.91

Info

Empirical formula:

H26.23K1.71Ca1.04Ba0.05Al3.64Si20.24O61

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.48

26.23

23.03

1.0079470

26.4384498

Oxygen

O

54.69

61

53.55

15.9994300

975.9652300

Aluminium

Al

5.50

3.64

3.20

26.9815382

98.2127990

Silicon

Si

31.86

20.24

17.77

28.0855300

568.4511272

Potassium

K

3.75

1.71

1.50

39.0983100

66.8581101

Calcium

Ca

2.34

1.04

0.91

40.0784000

41.6815360

Barium

Ba

0.38

0.05

0.04

137.3277000

6.8663850

Anal­y­sis wt%

4.51 K2O, 3.27 CaO, 0.41 BaO, 10.36 A12O3, 67.90 SiO2, 13.2 H2O,
in Nikita V. Chukanov, Svetlana Encheva, Petko Petrov, Igor V. Pekov, Dmitriy I. Belakovskiy, Sergey N. Britvin, Sergey M. Aksenov (2016)

Strunz 9th edi­tion incl. updates

9.GD.40

9: Silikate (Germanate)
G: Gerüstsilikate (Tektosilikate) mit zeolithischem H2O; Familie der Zeolithe
D: Ketten von fünfer-Ringen
40:Dachiardit-Gruppe

Lapis Clas­sifica­tion

VIII/J.22-020

VIII: SILIKATE
J: Gerüstsilikate (mit Zeolithen)
22: Zeolith-Gruppe; Faserzeolithe

Clas­sifica­tion by Hölzel

9.FM.300

9: SILICATES
F: Tektosilicates
M: Mordenite-Group

IMA sta­tus

anerkannt CNMNC Aug. 2015 - CNMNC Newsletter No. 27 Okt. 2015

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

Zeolite group  ⇒ DAC zeolite structure group  ⇒ Dachiardite series

Optical Properties

Color

weiß, farblos

Streak color

weiß

Lus­tre

Glasglanz

RI value α / ω / n

α = 1.477 (ber.)

RI value β

β = 1.478(2)

RI value γ / ε

γ = 1.481(2)

2V angle

2Vgem. = 65(10)°

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m, 2, m

Space Group number

12, 8, 5

Space Group

C2/m, Cm, C2

Cell param­e­ters a (Å)

18.670(8)

Cell param­e­ters b (Å)

7.511(3)

Cell param­e­ters c (Å)

10.231(4)

Cell param­e­ters a/b or c/a

2.486

Cell param­e­ters c/b

1.362

Cell param­e­ters α

90°

Cell param­e­ters β

107.79(3)°

Cell param­e­ters γ

90°

Z

1

Volumne (ų)

1366.094

X-Ray Pow­der Diffrac­tion

9.76(24), 8.85(58),4.985(13),4.870(59),3.807(16), 3.768(20), 3.457(100), 2.966(17)

XRD chart Dachiardite-K

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

Physical Properties

Hard­ness (Mohs)

4

Density (g/cm³)

2.18(2) gem., 2.169 ber.

2.169 ( ρ calc. Mineralienatlas )

Cleav­ages

vollkommen

Frac­ture

spröd

Chem­ical Prop­er­ties and Tests

IR Spektrum beschrieben in Nikita V. Chukanov, Svetlana Encheva, Petko Petrov, Igor V. Pekov, Dmitriy I. Belakovskiy, Sergey N. Britvin and Sergey M. Aksenov (2016): die Spektren von Dachiardit-K, -Ca und -Na sind sehr ähnlich.

(Co-)Type locality

(Co-)Type locality

Bulgarien/Kardschali (Кърджалийска) Oblast/Momtschilgrad (Momchilgrad), Obshtina/Zvezdel (Svesdel)/Dachiardite-K Vorkommen

Type mate­r­ial

Earth and Man National Museum, Sofia, Bulgarien

Col­lec­tion number of type mate­r­ial

23927

Par­a­ge­n­e­sis of type mate­r­ial

Chalcedon, Opal, Dachiardit-Ca, Dachiardit-Na, Ferrierit-Mg, Ferrierit-K, Klinoptilolith-Ca, Klinoptilolith-K, Mordenit, Smektit, Seladonit, Calcit, Baryt

Preface

Author (Name, Year)

Nikita V. Chukanov, Svetlana Encheva, Petko Petrov, Igor V. Pekov, Dmitriy I. Belakovskiy, Sergey N. Britvin and Sergey M. Aksenov (2016)

References

Chukanov, N.V., Encheva, S., Petrov, P., Pekov, I.V., Belakovskiy, D.I., Britvin, S.N. and Aksenov, S.M. (2015) Dachiardite-K, IMA 2015-041. CNMNC Newsletter No. 27, October 2015, page 1224; Mineralogical Magazine, 79, 1229–1236.

N. V. Chukanov, S. Encheva, P. Petrov, I. V. Pekov, D. I. Belakovskiy, S. N. Britvin, S. M. Aksenov: Dachiardite-K, (K2Ca)(Al4Si20O48) · 13H2O, a new zeolite from Eastern Rhodopes, Bulgaria. Geology of Ore Deposits Jhrg. 58, Nr. 8 (2016) S. 666–673. Zuerst in russ. Sprache publiziert: N.V. Chukanov, S. Encheva, P. Petrov, I.V. Pekov, D.I. Belakovskiy, S.N. Britvin, S.M. Aksenov. Zapiski Rossiiskogo Mineralogicheskogo Obshchestva, 2016, Nr. 1, S. 68–79.

IMA group assignments



 
 
 
 
 
 

 
 
 
 
(Ca,Na,K)4(Si,Al)24O48·13H2O
monoklin
C2/m

 
 
 
 
K4(Si20Al4O48)·13H2O
monoklin
C2/m, Cm, C2

 
 
 
 
Na4(Si20,Al4)O48·13H2O
monoklin
C2/m

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Actuality: 18. Jun 2022 - 11:11:20

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German

Dachiardit-K

English

Dachiardite-K

Russian

Дакиардит-K

CNMNC (IMA)-Number

IMA 2015-041

CNMNC symbol

Symbol

Dac-K

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