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Hogarthite

Collectors Summary

Color weiß, farblos
Streak color weiß
Lustre Seidenglanz, Glasglanz
Hardness (Mohs) 4
Cleavages vollkommen {010}
Fracture hakelig, splittrig
Crystal System monoklin, C2/m
Morphology Kristalle sind blockig bis abgeflacht, durchschnittlich 0,05 × 0,15 × 2 mm groß

Chemism

Chemical formula

(Na,K)2CaTi2Si10O26·8H2O

Empirical formula (analysis)

(Na0.78K0.620.51Ca0.09)Σ2.00Ca(Ti1.85Zr0.09Nb0.06)Σ2.00Si10.09O26·8H2O

Chemical composition

Calcium, Natrium, Silicium, Titan, Kalium, Sauerstoff, Wasserstoff

Unit weight: 1031.6878945811 u; Number of atoms in the formula: 65.09

Info

Empirical formula:

(Na0.78K0.62Vc0.51Ca0.09)Ca(Ti1.85Zr0.09Nb0.06)Si10.09O26·8H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Vacancy

Vc

0.00

0.51

0.78

0.0000000

0.0000000

Hydrogen

H

1.56

16

24.58

1.0079470

16.1271520

Oxygen

O

52.73

34

52.24

15.9994300

543.9806200

Sodium

Na

1.74

0.78

1.20

22.9897702

17.9320208

Silicon

Si

27.47

10.09

15.50

28.0855300

283.3829977

Potassium

K

2.35

0.62

0.95

39.0983100

24.2409522

Calcium

Ca

4.23

1.09

1.67

40.0784000

43.6854560

Titanium

Ti

8.58

1.85

2.84

47.8671000

88.5541350

Zirconium

Zr

0.80

0.09

0.14

91.2242000

8.2101780

Niobium

Nb

0.54

0.06

0.09

92.9063820

5.5743829

Analysis wt%

Na2O : 2.37 (1.69–2.92), K2O : 2.88 (2.61–3.17), CaO : 6.00 (5.40–6.31), TiO2 : 14.44 (13.70–15.83), ZrO2 : 1.11 (0.48–1.73), Nb2O5 : 0.78 (0.42–1.24), SiO2 : 59.27 (57.32–60.64), H2O : 14.10 (calc.), Total : 100.95

Strunz 9th edition incl. updates

9.DP.35

9: Silikate (Germanate)
D: Ketten- und Bandsilikate (Inosilikate)
P: Übergangsstrukturen: Ketten- und Bandsilikate - Schichtsilikat
35:Lemoynit-Gruppe

Lapis Classification

VIII/G.09-007

VIII: SILIKATE
G: Übergangsstrukturen zwischen Ketten- und Schichtsilikaten

Classification by Hölzel

9.DS.245

9: SILICATES
D: Inosilicates; ~[Si2O6]4--...2-Chain
S: ~[Si8O20]8--.. or ~[Si8O22]12--... Cylinder-Chains Narsarsukite-Group

IMA status

anerkannt - Neue Mineralien - IMA Web-Seite Sept. 2009

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Lemoynite group

Optical Properties

Color

weiß, farblos

Streak color

weiß

Diaphaneity (Transparency)

durchscheinend

Lustre

Seidenglanz, Glasglanz

max. Birefringence

0.051

Birefringence chart\! Hogarthite title=Birefringence chart Hogarthite

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

α = 1.567(1),

RI value β

β = 1.591(1)

RI value γ / ε

γ = 1.618(1)

Ri mean

1.592

2V angle

Biaxial (+) 87(1)º (gemessen) 88° (berechnet)

Orientation

X = b, Y˄c = 15º (im stumpfen Winkel gemessen β), Z = a

Optical Data Luminescence

Luminescence

keine unter UV

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

12

Space Group

C2/m

Cell parameters a (Å)

10.184

Cell parameters b (Å)

15.824

Cell parameters c (Å)

9.133

Cell parameters a/b or c/a

0.644

Cell parameters c/b

0.577

Cell parameters α

90°

Cell parameters β

104.47

Cell parameters γ

90°

Z

2

Volume (ų)

1425.11

Crystal structure

Struktur bestimmt

X-Ray Powder Diffraction

8.835(85), 7.913(100), 6.849(70), 5.526(40), 4.336(45), 3.514(80), 3.426(55), 2.792(50)

XRD chart Hogarthite

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

Morphology

Kristalle sind blockig bis abgeflacht, durchschnittlich 0,05 × 0,15 × 2 mm groß

Physical Properties

Hardness (Mohs)

4

Density (g/cm³)

2.40(1) (berechnet)

2.404 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen {010}

Fracture

hakelig, splittrig

Preface

Occurrences

auf Kluftzonen in metasomatisch verändertem Marmor Xenolithen

Associations

Calcit (zahlreiche Generationen), Quarz, Haineaultit, Labuntsovit-Mn, Lemoynit, Chabazit und Gmelinit-Na

Name from

Donald David Hogarth (1927-2020), Professor am Department of Earth Sciences, University of Ottawa, für seine Beiträge zur Mineralogie und zur Geologie der Grenville Province, und zur Nomenklatur der Pyrochlor-Gruppe.
Nachruf siehe The Canadian Mineralogist (2020) 58 (2): 289–290.

Author (Name, Year)

Andrew M. McDonald, 2009

References

Neue Mineralien - IMA Web-Seite Sept. 2009

Andrew M. McDonald, Peter Tarassoff, and George Y. Chao - HOGARTHITE, (Na,K)2CaTi2Si10O26·8H2O, A new member of the Lemoynite group from Mont Saint-Hilaire, Quebec: Characterization, Crystal-Structure Determination, and Origin - Canadian Mineralogist, 53, 13-30.

IMA group assignments

Other languages

German

Hogarthit

Spanish

Hogarthita

English

Hogarthite

Russian

Хогартит

CNMNC (IMA)-Number

IMA 2009-043

CNMNC symbol

Symbol

Hog

Locations with GPS information

IDs

GUSID (Global unique identifier short form) -rg2aLJrEU6XY7s-wTEJUA
GUID (Global unique identifier) 6836B8FA-6BB2-4E11-9763-BB3EC1310950
Database ID 5270