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Eckhardite

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Eckhardit und Housleyit
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Eckhardit und Housleyit
grünblaue, nadelige Gruppen von Eckhardit neben bläulichen, traubigen Aggregaten von Hausleyit und hellbraunen Kristallen von Markcooperit (?, unsicher, visuell bestimmt), Bird Nest Drift, Otto Mountain, San Bernardino County, Kalifornien, USA; BB < 1 mm, analysiert
Copyright: Joy Desor; Contribution: openpit
Location: USA/Kalifornien (California)/San Bernardino Co./Baker/Otto Mountain/Bird Nest drift
Mineral: Eckhardite, Housleyite
Image: 1581092917
Rating: 8 (votes: 1)
License: Usage for Mineralienatlas project only
Eckhardit und Housleyit

grünblaue, nadelige Gruppen von Eckhardit neben bläulichen, traubigen Aggregaten von Hausleyit und hellbraunen Kristallen von Markcooperit (?, unsicher, visuell bestimmt), Bird Nest Drift, Otto Mou...

Copyright: Joy Desor
Contribution: openpit 2020-02-07
Locality: Bird Nest drift / Otto Mountain / Baker / San Bernardino Co. / Kalifornien (California) / USA

Collectors Summary

Color hell blaugrün
Streak color sehr blass blaugrün
Lustre Glasglanz, Subdiamantglanz
Hardness (Mohs) 2 - 3
Cleavages möglich {101} (noch nicht beobachtet)
Fracture unregelmäßig
Crystal System monoklin, P21/n

Chemism

Chemical formula

(Ca,Pb)Cu2+Te6+O5(H2O)

Empirical formula (analysis)

Ca0.962Pb0.073Cu2+0.971Mg0.005Fe3+0.002Te6+0.986O6H2.052

Additional chem. information

Blei-Tellur Oxysalz

Chemical composition

Blei, Calcium, Kupfer, Tellur, Sauerstoff, Wasserstoff

Unit weight: 339.499869044 u; Number of atoms in the formula: 11.051

Info

Empirical formula:

Ca0.962Pb0.073Cu0.971Mg0.005Fe0.002Te0.986O6H2.052

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.61

2.05

18.57

1.0079470

2.0683072

Oxygen

O

28.28

6

54.29

15.9994300

95.9965800

Magnesium

Mg

0.04

0.01

0.05

24.3050600

0.1215253

Calcium

Ca

11.36

0.96

8.71

40.0784000

38.5554208

Iron

Fe

0.03

0

0.02

55.8452000

0.1116904

Copper

Cu

18.17

0.97

8.79

63.5463000

61.7034573

Tellurium

Te

37.06

0.99

8.92

127.6030000

125.8165580

Lead

Pb

4.46

0.07

0.66

207.2100000

15.1263300

Analysis wt%

PbO : 4.5, CaO : 15.09, MgO : 0.06, CuO : 21.59, Fe2O3 : 0.05, TeO3: 48.43, H2O* : 5.17, Total : 94.93; EDX (Kampf et al. 2013); *berechnet

Strunz 9th edition incl. updates

7.CC.

7: Sulfate (Selenate, Tellurate, Chromate, Molybdate, Wolframate)
C: Sulfate (Selenate, etc.) ohne weitere Anionen, mit H2O
C: Mit mittelgroßen und großen [Kationen]

Lapis Classification

IV/K.15-008

IV: OXIDE
K: Sulfite, Selenite, Tellurite
15: Tellurate mit [Te6+O6] 6--Gruppen und verwandte Strukturen

IMA status

anerkannt - CNMNC Newsletter No. 16, August 2013

Mineral status

anerkanntes Mineral

Optical Properties

Color

hell blaugrün

Streak color

sehr blass blaugrün

Lustre

Glasglanz, Subdiamantglanz

RI value α / ω / n

1.770

RI value β

1.860

RI value γ / ε

1.895

Ri mean

1.842

2V angle

Biaxial (-) 61.2 (gemessen)

Orientation

Z = b, X ≈ [101]

Dispersion

erkennbar, r < v

Pleochroism

Z = hell grünblau < Y sehr blass blaugrün < X farblos

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/n

Cell parameters a (Å)

8.1606

Cell parameters b (Å)

5.3076

Cell parameters c (Å)

11.4412

Cell parameters a/b or c/a

1.538

Cell parameters c/b

2.156

Cell parameters α

90°

Cell parameters β

101.549°

Cell parameters γ

90°

Z

4

Volume (ų)

485.522

Crystal structure

Neuer Strukturtyp, Struktur bestimmt

X-Ray Powder Diffraction

5.94(100), 3.287(80), 2.645(89), 2.485(48), 2.245(46), 1.809(40), 1.552(42), 1.530(43)

XRD chart Eckhardite

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 - 3

Density (g/cm³)

4.644

4.644 ( ρ calc. Mineralienatlas )

Cleavages

möglich {101} (noch nicht beobachtet)

Fracture

unregelmäßig

Tenacity

spröde

Radioactivity

keine

(Co-)Type locality

(Co-)Type locality

USA/Kalifornien (California)/San Bernardino Co./Baker/Otto Mountain/Aga Mine

USA/Kalifornien (California)/San Bernardino Co./Baker/Otto Mountain/Bird Nest drift

Type material

Mineral Sciences Department, Natural History Museum of Los Angeles County, Los Angeles, California, USA

Collection number of type material

62512 und 64011

Preface

Name from

Eckhard D. Stuart (* 1939), Bereitsteller von Analysenmaterial

Author (Name, Year)

Anthony R. Kampf, Stuart J. Mills, Robert M. Housley, George R. Rossman, Joseph Marty and Brent Thorne (2013)

References

Kampf, A.R., Mills, S.J., Housley, R.M., Rossman, G.R., Marty, J. and Thorne, B. - Eckhardite, IMA 2012-085. CNMNC Newsletter No. 16, August 2013, page 2696; Mineralogical Magazine 77 (2013), 2695-2709.

Kampf, A.R., Mills, S.J., Housley, R.M., Rossman, G.R., Marty, J. and Thorne, B. - Lead-tellurium oxysalts from Otto Mountain near Baker, California: XI. Eckhardite, (Ca,Pb)Cu2+Te6+O5(H2O), a new mineral with HCP stair-step layers. In: American Mineralogist 98 (2013), 1617-1623

Other languages

German

Eckhardit

English

Eckhardite

Russian

Экхардит

CNMNC (IMA)-Number

IMA 2012-085

CNMNC symbol

Symbol

Ehd

Locations with GPS information

IDs

GUSID (Global unique identifier short form) HbCRsuWHJkKQFa4wdWkMzg
GUID (Global unique identifier) B291B01D-87E5-4226-9015-AE3075690CCE
Database ID 7592