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Eckhardite

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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 Mou...

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)

Ca_0.962Pb_0.073Cu²⁺_0.971Mg_0.005Fe³⁺_0.002Te⁶⁺_0.986O₆H_2.052

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:

Ca_0.962Pb_0.073Cu_0.971Mg_0.005Fe_0.002Te_0.986O₆H_2.052

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

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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]

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
Volumne (Å³)	485.522
Kristall 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)
	Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

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Crystal Structure 3D

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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

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

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Karpovite	Tl₂VO(SO₄)₂(H₂O) monoklin : 2 : P2₁	7.CC.
Eckhardite	(Ca,Pb)Cu²⁺Te⁶⁺O₅(H₂O) monoklin : 2/m : P2₁/n	7.CC.
Evdokimovite	Tl₄(VO)₃(SO₄)₅(H₂O)₅ monoklin : 2/m : P2₁/n	7.CC.
Andychristyite	PbCu²⁺Te⁶⁺O₅(H₂O) triklin : 1 : P1	7.CC.
Krausite	KFe³⁺(SO₄)₂·H₂O monoklin : 2/m : P2₁/m	7.CC.05
Amarillite	NaFe³⁺(SO₄)₂·6H₂O monoklin : 2/m : C2/c	7.CC.10
Tamarugite	NaAl(SO₄)₂·6H₂O monoklin : 2/m : P2₁/a	7.CC.10
Kalinite	KAl(SO₄)₂·11 H₂O monoklin : 2/m : C2/c	7.CC.15
Mendozite	NaAl(SO₄)₂·11H₂O monoklin : 2/m : C2/c	7.CC.15
Alum-(K)	KAl(SO₄)₂·12H₂O kubisch : m3 : Pa3	7.CC.20
Lonecreekite	(NH₄)(Fe³⁺,Al)(SO₄)₂·12H₂O kubisch : m3 : Pa3	7.CC.20
Tschermigite	(NH₄)Al(SO₄)₂·12H₂O kubisch : m3 : Pa3	7.CC.20
Lanmuchangite	TlAl[SO₄]₂·12H₂O kubisch : m3 : Pa3	7.CC.20
Alum-(Na)	NaAl(SO₄)₂·12H₂O kubisch : m3 : Pa3	7.CC.20
Voltaite	K₂Fe²⁺₅Fe³⁺₃Al(SO₄)₁₂·18H₂O kubisch : m3m : Fd3c	7.CC.25
Pertlikite	K₂(Fe²⁺,Mg)₂(Mg,Fe³⁺)₄Fe³⁺₂Al(SO₄)₁₂·18H₂O tetragonal : 4mm : I4₁cd	7.CC.25
Ammoniomagnesiovoltaite	(NH₄)₂Mg₅Fe³⁺₃Al(SO₄)₁₂·18H₂O kubisch : m3m : Fd3c	7.CC.25
Zincovoltaite	K₂(Zn,Fe²⁺,Mn)₅Fe₃³⁺Al(SO₄)₁₂·18H₂O kubisch : m3m : Fd3c	7.CC.25
Ammoniovoltaite	(NH₄)₂Fe²⁺₅Fe³⁺₃Al(SO₄)₁₂(H₂O)₁₈ kubisch : m3m : Fd3c	7.CC.25
Magnesiovoltaite	K₂Mg₅Fe³⁺₃Al(SO₄)₁₂·18H₂O kubisch : m3m : Fd3c	7.CC.25
Kröhnkite	Na₂Cu(SO₄)₂· 2H₂O monoklin : 2/m : P2₁/c	7.CC.30
Ferrinatrite	Na₃Fe(SO₄)₃·3H₂O trigonal : 3 : P3	7.CC.35
Goldichite	KFe³⁺(SO₄)₂·4H₂O monoklin : 2/m : P2₁/c	7.CC.40
Löweite	Na₁₂Mg₇(SO₄)₁₃·15H₂O trigonal : 3 : R3	7.CC.45
Blödite	Na₂Mg(SO₄)₂·4H₂O monoklin : 2/m : P2₁/a	7.CC.50
Changoite	Na₂Zn[SO₄]₂·4H₂O monoklin : 2/m : P2₁/a	7.CC.50
Nickelblödite	Na₂(Ni,Mg)(SO₄)₂·4H₂O monoklin : 2/m : P2₁/a	7.CC.50
Cobaltoblödite	Na₂Co(SO₄)₂·4H₂O monoklin : 2/m : P2₁/a	7.CC.50
Manganoblödite	Na₂Mn(SO₄)₂·4H₂O monoklin : 2/m : P2₁/a	7.CC.50
Leonite	K₂Mg(SO₄)₂·4H₂O monoklin : 2/m : C2/m	7.CC.55
Mereiterite	K₂Fe²⁺[SO₄]₂·4H₂O monoklin : 2/m : C2/m	7.CC.55
Mohrite	(NH₄)₂Fe²⁺(SO₄)₂·6H₂O monoklin : 2/m : P2₁/a	7.CC.60
Konyaite	Na₂Mg(SO₄)₂·5H₂O monoklin : 2/m : P2₁/c	7.CC.60
Picromerite	K₂Mg(SO₄)₂·6H₂O monoklin : 2/m : P2₁/a	7.CC.60
Cyanochroite	K₂Cu(SO₄)·6H₂O monoklin : 2/m : P2₁/c	7.CC.60
Boussingaultite	(NH₄)₂Mg(SO₄)₂·6H₂O monoklin : 2/m : P2₁/a	7.CC.60
Katerinopoulosite	(NH₄)₂Zn(SO₄)₂·6H₂O monoklin : 2/m : P2₁/a	7.CC.60
Nickelpicromerite	K₂Ni(SO₄)₂·6H₂O monoklin : 2/m : P2₁/c	7.CC.60
'Nickelboussingaultite'	(NH₄)₂(Ni,Mg)(SO₄)₂·6H₂O	7.CC.60
Polyhalite	K₂Ca₂Mg(SO₄)₄·2H₂O triklin : 1 : F1	7.CC.65
Leightonite	K₂Ca₂Cu(SO₄)₄·2H₂O monoklin : 2/m : C2/c	7.CC.70

Other languages

German	Eckhardit
English	Eckhardite
Russian	Экхардит

IMA Number

IMA 2012-085

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

German pages	DeWikiPedia - search for: Eckhardit Google-Bilder-Suche - search for: Eckhardit Mineralogisch-Petrographisches-Institut Hamburg - search for: Eckhardit
English pages	Mindat - search for: Eckhardite Webmineral - search for:Eckhardite Handbook-of-Mineralogy - search for: Eckhardite RRUFF - Raman, XRD and other mineral data - search for: Eckhardite RRUFF - References and PDF downloads - search for: Eckhardite American-Mineralogist-Crystal-Structure-Database - search for: Eckhardite Athena - search for: Eckhardite
Russian pages	Webmineral.ru - search for: Экхардит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Eckhardit
Crystal-Treasure.com - search for: Eckhardit
Bosse - search for: Eckhardit

Locations with GPS information