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Hydroxymcglassonite-(K) (Hydroxymcglassonit-(K))

Collectors Summary

Color farblos
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 4.5–5.0
Cleavages vollkommen nach {001}
Crystal System tetragonal, P4/mnc
Morphology körnig (<0.05 mm)

Chemism

Chemical formula

KSr4Si8O20(OH)·8H2O

Empirical formula (analysis)

K1.01(Sr2.99Ca1.03)Σ4.02Si7.99O20(OH)·8H2O

Chemical composition

Silicium, Strontium, Kalium, Sauerstoff, Wasserstoff

Unit weight: 1048.2787888 u; Number of atoms in the formula: 59.02

Info

Empirical formula:

K1.01(Sr2.99Ca1.03)Si7.99O20(OH)·8H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

1.63

17

28.80

1.0079470

17.1350990

Oxygen

O

44.26

29

49.14

15.9994300

463.9834700

Silicon

Si

21.41

7.99

13.54

28.0855300

224.4033847

Potassium

K

3.77

1.01

1.71

39.0983100

39.4892931

Calcium

Ca

3.94

1.03

1.75

40.0784000

41.2807520

Strontium

Sr

24.99

2.99

5.07

87.6210000

261.9867900

IMA status

anerkannt - CNMNC Newsletter 59, Dezember 2020 - Januar 2021

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Apophyllit-Gruppe

Optical Properties

Color

farblos

Streak color

weiß

Diaphaneity (Transparency)

durchsichtig

Lustre

Glasglanz

Crystallography

Crystal System

tetragonal

Class (H-M)

4/mmm

Space Group number

128

Space Group

P4/mnc

Cell parameters a (Å)

9.0792(2)

Cell parameters b (Å)

-

Cell parameters c (Å)

16.1551(9)

Cell parameters a/b or c/a

1.779

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

2

Volume (ų)

1331.695

Crystal structure

Apophyllit-Gruppe; Struktur ermittelt

X-Ray Powder Diffraction

8.008(94), 4.539(42), 3.940(50), 3.638(81), 3.055(34), 2.993(58), 2.800(28), 2.538(100)

XRD chart Hydroxymcglassonite-(K)

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

Morphology

körnig (<0.05 mm)

Physical Properties

Hardness (Mohs)

4.5–5.0

Density (g/cm³)

2.60(3) gem. 2.614 ber.

2.614 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen nach {001}

(Co-)Type locality

(Co-)Type locality

Südafrika/Nordkap (Northern Cape), Provinz/Kalahari Manganese Field/Hotazel/Wessel's Mine (Wessels Mine)

Type material

Das Typusmaterial ist in den Sammlungen des Mineralienmuseums der University of Arizona, 1601 E University Blvd, Tucson, AZ 85719, USA, Katalognummer 22691 (Holotypus), und des RRUFF-Projekts, Hinterlegungsnummer R200004 (Cotypus) hinterlegt

Paragenesis of type material

Meieranit, Sugilit, Aegirin, Pektolith, Yuzuxiangit

Preface

Name from

James Archer McGlasson (geb. 1948), Geologe, Bergbauexperte und Mineraliensammler; biografische Einzelheiten siehe Bruce Cairncross, Jaco J. Van Nieuwenhuizen, Xiangping Gu, Hexiong Yang: Who's Who in Mineral Names: Tucson Collector James “Jim” Archer McGlasson (b. 1948). Rocks & Minerals Vol. 98, Issue 1 (2023) S. 94-98.

Author (Name, Year)

Hexiong Yang, Xiangping Gu, und Michael M. Scott (2022)

References

Yang, H., Gu, X., and Scott, M. M.: Hydroxymcglassonite-(K), IMA 2020-066, in: CNMNC Newsletter 59, Eur. J. Mineral., 33, https://doi.org/10.5194/ejm-33-139-2021, 2021.

Hexiong Yang; Xiangping Gu; Michael M. Scott: Hydroxymcglassonite-(K), KSr4Si8O20(OH)·8H2O, the first Sr-bearing member of the apophyllite group, from the Wessels mine, Kalahari Manganese Field, South Africa. American Mineralogist Vol. 107, Nr. 9 (2022) S. 1818-1822. doi: 10.2138/am-2022-8210

IMA group assignments

Other languages

German

Hydroxymcglassonit-(K)

English

Hydroxymcglassonite-(K)

CNMNC (IMA)-Number

IMA 2020-066

CNMNC symbol

Symbol

Hmg

Locations with GPS information

IDs

GUSID (Global unique identifier short form) oiBOCBsq_kudu2EXwa1e2g
GUID (Global unique identifier) 084E20A2-2A1B-4BFE-9DBB-6117C1AD5EDA
Database ID 8962