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Edwardsite

A valid IMA mineral species

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Photos of Edwardsite (4)

Edwardsite Gallery Search Photos of Edwardsite

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Edwardsite

Block 14 opencut, Broken Hill, Broken Hill district, Yancowinna Co., New South Wales, Australia

Edwardsite

Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia

Edwardsite

Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia

Edwardsite

Block 14 opencut, Broken Hill, Broken Hill district, Yancowinna Co., New South Wales, Australia

Edwardsite

Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia

Edwardsite

Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia

Edwardsite

Block 14 opencut, Broken Hill, Broken Hill district, Yancowinna Co., New South Wales, Australia

Edwardsite

Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia

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About EdwardsiteHide

Formula:

Cu₃Cd₂(SO₄)₂(OH)₆ · 4H₂O

Colour:

Pale blue

Lustre:

Vitreous

Hardness:

Specific Gravity:

3.53 (Calculated)

Crystal System:

Monoclinic

Name:

Named in 2010 by P. Elliott, J. Brugger, and T. Caradoc-Davies in honor of Dr. Austin Burton Edwards (15 August 1909, Caulfield, Victoria, Australia - 8 October 1960, Rome, Italy), mineralogist and petrologist from 1934-1960 at CSIRO, for his contribution to the earth sciences, in particular, studies of the geology, geochemistry and mineralogy of Australian ore deposits. He published 18 papers on Broken Hill geology and mineralogy.

Type Locality:

ⓘ Block 14 opencut, Broken Hill, Broken Hill district, Yancowinna Co., New South Wales, Australia

One of the rare secondary Cd minerals.

May be confused with Cd-bearing varieties of christelite.

Unique IdentifiersHide

Mindat ID:

39682

Long-form identifier:

mindat:1:1:39682:4

GUID
(UUID V4):

6807c540-69f4-4660-a5fa-c5270479e19e

IMA Classification of EdwardsiteHide

IMA status:

Approved

IMA Formula:

Cu₃Cd₂(SO₄)₂(OH)₆ · 4H₂O

Approval year:

2009

First published:

2010

Type description reference:

Elliott, P., Brugger, J., Caradoc-Davies, T. (2010) Description and crystal structure of a new mineral, edwardsite, Cu₃Cd₂(SO₄)₂(OH)₆·4H₂O, from Broken Hill, New South Wales, Australia. Mineralogical Magazine, 74 (1) 39-53 doi:10.1180/minmag.2010.074.1.39

Classification of EdwardsiteHide

Strunz-mindat (2024):

7.DD.30

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H₂O
D : With only medium-sized cations; sheets of edge-sharing octahedra

Dana 8th ed.:

31.6.10.

31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
6 : (AB)₅(XO₄)₂Z_q·xH₂O

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol	Source	Reference
Edw	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of EdwardsiteHide

Lustre:

Vitreous

Transparency:

Transparent

Colour:

Pale blue

Streak:

White

Hardness:

3 on Mohs scale

Comment:

Approximate value.

Tenacity:

Brittle

Cleavage:

Perfect
Excellent cleavage parallel to {100}.

Fracture:

Irregular/Uneven

Density:

3.53 g/cm³ (Calculated)

Comment:

Not measured

Optical Data of EdwardsiteHide

Type:

Biaxial (-)

RI values:

n_α = 1.740 n_β = 1.762(4) n_γ = 1.770

2V:

Measured: 62°

Max Birefringence:

δ = 0.030

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Surface Relief:

High

Optical Extinction:

X = b, Y ~ a, Z ~ c, with inclined extinction

Pleochroism:

Non-pleochroic

Comments:

Negative elongation (i.e. length-fast).

Refractive indices were obtained in white light using Cargille immersion liquids.

Chemistry of EdwardsiteHide

Mindat Formula:

Cu₃Cd₂(SO₄)₂(OH)₆ · 4H₂O

Elements listed:

Cd, Cu, H, O, S - search for minerals with similar chemistry

Crystallography of EdwardsiteHide

Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Space Group:

P2₁/b

Setting:

P2₁/c

Cell Parameters:

a = 10.863(2) Å, b = 13.129(3) Å, c = 11.169(2) Å
β = 113.04(3)°

Ratio:

a:b:c = 0.827 : 1 : 0.851

Unit Cell V:

1,465.86 Å³ (Calculated from Unit Cell)

Morphology:

Flattened on {100} and often elongated along [010], with predominant crystal forms {100}, {001} and possibly {043}, with minor {010} plus other minor prisms and domes.

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0014597	Edwardsite	Elliot P, Brugger J, Caradoc-Davies T (2010) Description and crystal structure of a new mineral, edwardsite, Cu3Cd2(SO4)2(OH)64H2O, from Broken Hill, New South Wales, Australia* Mineralogical Magazine 74 39-53		2010	Block 14 Opencut, Broken Hill, Australia	0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Edwardsite'
loop_
_publ_author_name
'Elliot P'
'Brugger J'
'Caradoc-Davies T'
_journal_name_full 'Mineralogical Magazine'
_journal_volume 74 
_journal_year 2010
_journal_page_first 39
_journal_page_last 53
_publ_section_title
;
 Description and crystal structure of a new mineral, edwardsite,
 Cu3Cd2(SO4)2(OH)6*4H2O, from Broken Hill, New South Wales, Australia
;
_database_code_amcsd 0014597
_chemical_compound_source 'Block 14 Opencut, Broken Hill, Australia'
_chemical_formula_sum 'Cu3 Cd1.89 Zn.11 S2 O18 H28'
_cell_length_a 10.863
_cell_length_b 13.129
_cell_length_c 11.169
_cell_angle_alpha 90
_cell_angle_beta 113.04
_cell_angle_gamma 90
_cell_volume 1465.862
_exptl_crystal_density_diffrn      3.583
_symmetry_space_group_name_H-M 'P 1 21/c 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,1/2-y,1/2+z'
  '-x,1/2+y,1/2-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Cu1   0.52495   0.74448   1.01316   1.00000   0.00950
Cu2   0.50000   0.50000   1.00000   1.00000   0.00930
Cu3   0.50000   0.50000   0.50000   1.00000   0.00950
Cu4   0.49372   0.37193   0.74106   1.00000   0.00910
Cd1  -0.00341   0.56798   0.31880   1.00000   0.01030
Cd2   0.56339   0.61959   0.77299   0.89000   0.01170
Zn   0.56339   0.61959   0.77299   0.11000   0.01170
S1   0.18421   0.38395   0.49236   1.00000   0.00920
S2   0.19454   0.61158   0.89026   1.00000   0.00950
O1   0.13020   0.28140   0.48830   1.00000   0.01570
O2   0.32920   0.38030   0.52690   1.00000   0.01120
O3   0.15500   0.44830   0.58770   1.00000   0.01180
O4   0.12220   0.43070   0.36040   1.00000   0.01250
O5   0.32880   0.62170   0.99320   1.00000   0.01330
O6   0.18570   0.66880   0.77280   1.00000   0.01410
O7   0.09440   0.65260   0.93800   1.00000   0.01390
O8   0.16630   0.50210   0.85620   1.00000   0.01340
O-H9   0.60770   0.61750   0.98630   1.00000   0.01480
O-H10   0.60950   0.72750   1.20140   1.00000   0.01100
O-H11   0.55730   0.25270   0.67700   1.00000   0.01260
O-H12   0.43160   0.49030   0.80790   1.00000   0.01140
O-H13   0.44260   0.63100   0.54990   1.00000   0.01100
O-H14   0.40440   0.52950   0.31570   1.00000   0.01250
Wat15   0.13350   0.62480   0.20900   1.00000   0.01750
Wat16   0.15660   0.65070   0.49780   1.00000   0.01380
Wat17  -0.10000   0.72010   0.25040   1.00000   0.01730
Wat18   0.79940   0.59790   0.86060   1.00000   0.02470
H1   0.70000   0.61500   1.01100   1.00000   0.03500
H2   0.69800   0.70700   1.22600   1.00000   0.03500
H3   0.64400   0.22800   0.70000   1.00000   0.03500
H4   0.33600   0.48800   0.77100   1.00000   0.03500
H5   0.35300   0.63400   0.53400   1.00000   0.03500
H6   0.32100   0.55600   0.30200   1.00000   0.03500
H7   0.14300   0.69600   0.20600   1.00000   0.03500
H8   0.11600   0.60100   0.12500   1.00000   0.03500
H9   0.13500   0.72000   0.49400   1.00000   0.03500
H10   0.14500   0.62500   0.57000   1.00000   0.03500
H11  -0.10200   0.75100   0.17100   1.00000   0.03500
H12  -0.04200   0.76900   0.31200   1.00000   0.03500
H13   0.83700   0.65500   0.91300   1.00000   0.03500
H14   0.86200   0.57200   0.83100   1.00000   0.03500
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Cu1 0.01170 0.00600 0.01050 -0.00100 0.00410 0.00030
Cu2 0.01110 0.00670 0.00960 -0.00140 0.00360 -0.00070
Cu3 0.01150 0.00650 0.01030 0.00070 0.00420 0.00130
Cu4 0.01150 0.00590 0.01050 -0.00030 0.00500 0.00050
Cd1 0.01030 0.00790 0.01230 0.00036 0.00390 -0.00009
Cd2 0.02010 0.00570 0.01050 -0.00116 0.00740 -0.00215
Zn 0.02010 0.00570 0.01050 -0.00116 0.00740 -0.00215
S1 0.01030 0.00690 0.01010 0.00000 0.00370 0.00060
S2 0.01010 0.00770 0.01150 -0.00180 0.00510 -0.00070
O1 0.02100 0.00700 0.02000 0.00170 0.00800 -0.00210
O2 0.01000 0.01400 0.00700 -0.00180 0.00010 0.00020
O3 0.01400 0.00900 0.01500 -0.00180 0.00830 0.00160
O4 0.01700 0.01100 0.01000 0.00440 0.00540 0.00500
O5 0.01200 0.01200 0.01500 -0.00060 0.00380 -0.00110
O6 0.01700 0.01300 0.01200 0.00290 0.00560 0.00060
O7 0.01800 0.01100 0.01500 -0.00200 0.00840 -0.00030
O8 0.01300 0.00900 0.01600 -0.00120 0.00250 0.00190
O-H9 0.01300 0.01100 0.02000 -0.00370 0.00500 -0.00120
O-H10 0.01100 0.00800 0.01200 0.00000 0.00230 0.00320
O-H11 0.01700 0.00900 0.01400 0.00330 0.00820 0.00310
O-H12 0.01200 0.01100 0.01300 -0.00480 0.00610 -0.00310
O-H13 0.01400 0.00700 0.01200 0.00060 0.00490 0.00140
O-H14 0.01300 0.01400 0.01200 0.00120 0.00700 0.00110
Wat15 0.02000 0.01600 0.01900 -0.00020 0.01100 -0.00260
Wat16 0.01500 0.00900 0.01800 0.00150 0.00680 0.00010
Wat17 0.02400 0.00800 0.01900 0.00180 0.00700 0.00160
Wat18 0.01700 0.02300 0.03100 -0.00100 0.00600 -0.00400

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
9.991 Å	(90)
5.001 Å	(90)
4.591 Å	(45)
3.332 Å	(60)
2.824 Å	(40)
2.769 Å	(55)
2.670 Å	(47)

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 7: Great Oxidation Event	<2.4
47a : [Near-surface hydration of prior minerals]
47b : [Sulfates and sulfites]

Type Occurrence of EdwardsiteHide

Type Locality:

ⓘ Block 14 opencut, Broken Hill, Broken Hill district, Yancowinna Co., New South Wales, Australia

General Appearance of Type Material:

Druses of tabular and bladed crystals up to 0.06 mm in size.

Place of Conservation of Type Material:

Holotype specimen is deposited in the South Australian Museum, Adelaide, South Australia, (registration number G32703).

Geological Setting of Type Material:

Ore stockpile from a Ag-Pb-Zn deposit.

Associated Minerals at Type Locality:

Niedermayrite

Christelite

Reference:

Elliott, P., Brugger, J. Caradoc-Davies, T. (2010) Description and crystal structure of a new mineral, edwardsite, Cu3Cd2(SO4)2(OH)6•4H2O, from Broken Hill, New South Wales, Australia. Mineralogical Magazine: 74: 39–53.

Download:

https://rruff.info/rruff_1.0/uploads/MM74_39.pdf

Synonyms of EdwardsiteHide

IMA2009-048

Common AssociatesHide

Associated Minerals Based on Photo Data:

1 photo of Edwardsite associated with Lauraniite

Cu₆Cd₂(SO₄)₂(OH)₁₂ · 5H₂O

Related Minerals - Strunz-mindat Grouping Hide

7.DD.	Asagiite	NiCu₄(SO₄)₂(OH)₆ · 6H₂O	Mon. 2/m : P2₁/b
7.DD.05	Felsőbányaite	Al₄(SO₄)(OH)₁₀ · 4H₂O	Mon. 2 : P2₁
7.DD.07	Llantenesite	Cu₆Al[SeO₄](OH)₁₂Cl · 3H₂O	Trig. 3m : P3 1c
7.DD.10	Langite	Cu₄(SO₄)(OH)₆ · 2H₂O	Mon. m
7.DD.10	Posnjakite	Cu₄(SO₄)(OH)₆ · H₂O	Mon. m : Pm
7.DD.10	Wroewolfeite	Cu₄(SO₄)(OH)₆ · 2H₂O	Mon. m : Pm
7.DD.10	Gobelinite	CoCu₄(SO₄)₂(OH)₆ · 6H₂O	Mon. 2/m : P2₁/m
7.DD.10	Fehrite	MgCu₄(SO₄)₂(OH)₆ · 6H₂O	Mon. 2/m : P2₁/b
7.DD.15	Spangolite	Cu₆Al(SO₄)(OH)₁₂Cl · 3H₂O	Trig. 3m : P3 1c
7.DD.15	Kobyashevite	Cu₅(SO₄)₂(OH)₆ · 4H₂O	Tric. 1 : P1
7.DD.15	Unnamed (Dimorph of Devilline)	CaCu₄(SO₄)₂(OH)₆ · 3H₂O	Mon. 2/m : P2₁/b
7.DD.20	Ktenasite	ZnCu₄(SO₄)₂(OH)₆ · 6H₂O	Mon. 2/m : P2₁/b
7.DD.25	Christelite	Cu₂Zn₃(SO₄)₂(OH)₆ · 4H₂O	Tric. 1 : P1
7.DD.30	Campigliaite	Mn²⁺Cu₄(SO₄)₂(OH)₆ · 4H₂O	Mon. 2 : B2
7.DD.30	Devilline	CaCu₄(SO₄)₂(OH)₆ · 3H₂O	Mon. 2/m : P2₁/b
7.DD.30	Orthoserpierite	Ca(Cu,Zn)₄(SO₄)₂(OH)₆ · 3H₂O	Orth. mm2 : Pca2₁
7.DD.30	Serpierite	Ca(Cu,Zn)₄(SO₄)₂(OH)₆ · 3H₂O	Mon. 2/m : B2/b
7.DD.30	Niedermayrite	CdCu₄(SO₄)₂(OH)₆ · 4H₂O	Mon. 2/m : P2₁/m
7.DD.35	Carrboydite	(Ni_1-xAl_x)(SO₄)_x/2(OH)₂ · nH₂O	Hex.
7.DD.35	Glaucocerinite	(Zn_1-xAl_x)(OH)₂(SO₄)_x/2 · nH₂O	Hex.
7.DD.35	Honessite	(Ni_1-xFe³⁺_x)(OH)₂[SO₄]_x/2 · nH₂O	Trig.
7.DD.35	Hydrohonessite	(Ni_1-xFe³⁺_x)(OH)₂(SO₄)_x/2 · nH₂O	Hex.
7.DD.35	Motukoreaite	Mg₆Al₃(OH)₁₈[Na(H₂O)₆][SO₄]₂ · 6H₂O	Trig. 3m (3 2/m) : R3m
7.DD.35	Mountkeithite	[(Mg_1-xFe³⁺_x)(OH)₂][SO₄]_x/2 · nH₂O	Hex.
7.DD.35	Shigaite	Mn₆Al₃(OH)₁₈[Na(H₂O)₆](SO₄)₂ · 6H₂O	Trig. 3 : R3
7.DD.35	Wermlandite	Mg₇Al₂(OH)₁₈[Ca(H₂O)₆][SO₄]₂ · 6H₂O	Trig. 3m (3 2/m) : P3c1
7.DD.35	Woodwardite	Cu_1-xAl_x(OH)₂(SO₄)_x/2 · nH₂O	Trig. 3m (3 2/m) : R3m
7.DD.35	Zincaluminite	Zn₆Al₆(SO₄)₂(OH)₁₆ · 5H₂O
7.DD.35	Hydrowoodwardite	(Cu_1-xAl_x)(OH)₂[SO₄]_x/2 · nH₂O	Trig. 3m (3 2/m) : R3m
7.DD.35	Zincowoodwardite	Zn_1-xAl_x(OH)₂[SO₄]_x/2 · nH₂O	Trig.
7.DD.35	Natroglaucocerinite	Zn₆Al₃(OH)₁₈[Na(H₂O)₆](SO₄)₂ · 6H₂O	Hex.
7.DD.35	Nikischerite	Fe²⁺₆Al₃(OH)₁₈[Na(H₂O)₆](SO₄)₂ · 6H₂O	Trig. 3 : R3
7.DD.40	Isselite	Cu₆(SO₄)(OH)₁₀ · 5H₂O	Orth. mm2 : Pmn2₁
7.DD.40	Lawsonbauerite	(Mn²⁺,Mg)₉Zn₄(SO₄)₂(OH)₂₂ · 8H₂O	Mon. 2/m : P2₁/b
7.DD.40	Torreyite	(Mg,Mn²⁺)₇◻₂Mn²⁺₂Zn₄(SO₄)₂(OH)₂₂ · 8H₂O	Mon. 2/m : P2₁/b
7.DD.45	Mooreite	Mg₉◻₂Mn₂Zn₄(SO₄)₂(OH)₂₆ · 8H₂O	Mon. 2/m : P2/b
7.DD.45	Hodgesmithite	(Cu,Zn)₆Zn(SO₄)₂(OH)₁₀ · 3H₂O	Trig. 3 : P3
7.DD.47	Lahnsteinite	Zn₄(SO₄)(OH)₆ · 3H2O	Tric. 1 : P1
7.DD.50	Namuwite	Zn₄(SO₄)(OH)₆ · 4H₂O	Trig. 3 : P3
7.DD.50	Minohlite	(Cu,Zn)₇(SO₄)₂(OH)₁₀ · 8H₂O	Hex.
7.DD.52	Lauraniite	Cu₆Cd₂(SO₄)₂(OH)₁₂ · 5H₂O	Mon. 2/m : P2₁/b
7.DD.55	Bechererite	Zn₇Cu(OH)₁₃[(SiO(OH)₃(SO₄)]	Trig. 3 : P3
7.DD.60	Ramsbeckite	(Cu,Zn)₁₅(SO₄)₄(OH)₂₂ · 6H₂O	Mon. 2/m
7.DD.65	Vonbezingite	Ca₆Cu₃(SO₄)₃(OH)₁₂ · 2H₂O	Mon. 2/m : P2₁/b
7.DD.70	Redgillite	Cu₆(SO₄)(OH)₁₀ · H₂O	Mon. 2/m : P2₁/b
7.DD.75	Chalcoalumite	CuAl₄(SO₄)(OH)₁₂ · 3H₂O	Mon. 2 : P2₁
7.DD.75	Nickelalumite	NiAl₄(SO₄)(OH)₁₂(H₂O)₃	Mon. 2/m
7.DD.75	Kyrgyzstanite	ZnAl₄(SO₄)(OH)₁₂ · 3H₂O	Mon. 2/m
7.DD.80	Guarinoite	Zn₆(SO₄)(OH)₁₀ · 5H₂O	Hex.
7.DD.80	Schulenbergite	(Cu,Zn)₇(SO₄)₂(OH)₁₀ · 3H₂O	Trig. 3
7.DD.80	Thérèsemagnanite	NaCo₄(SO₄)(OH)₆Cl · 6H₂O	Trig. 3 : P3
7.DD.80	UM1992-30-SO:CCuHZn	(Zn,Cu)₇(SO₄,CO₃)₂(OH)₁₀ · 3H₂O	Trig. 3 : P3
7.DD.85	Montetrisaite	Cu₆(SO₄)(OH)₁₀ · 2H₂O	Orth. mm2 : Cmc2₁

Fluorescence of EdwardsiteHide

In UV light:

Not fluorescent

Other InformationHide

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for EdwardsiteHide

mindat.org URL:

https://www.mindat.org/min-39682.html
Please feel free to link to this page.

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External Links:

Look for Edwardsite on Webmineral

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Look for Edwardsite on Mineralien Atlas

Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

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References for EdwardsiteHide

Reference List:

(2023) Edwardsite. Handbook of Mineralogy. Mineralogical Society of America

Localities for EdwardsiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the

symbol to view information about a locality. The

symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed.

- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality.

- Good crystals or important locality for species.

- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). ~~Struck out~~ - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.


Australia (TL)
New South Wales Yancowinna Co. Broken Hill district Broken Hill ⓘ Block 14 opencut (TL)	Elliott et al. (2010)

Greece
Attica East Attica Lavreotiki Lavrion Mining District Agios Konstantinos (Kamariza) Kamariza Mines (Kamareza Mines) ⓘ Hilarion Mine	Rieck et al. (2018)
Km 3 Kaminiza mines ⓘ Esperanza Mine	Rieck et al. (2018) +1 other reference
Sounion Cato Sounio mines ⓘ Sounion Mine No. 19	Rieck et al. (2018)

Namibia
Oshikoto Region Tsumeb ⓘ Tsumeb Mine (Ongopolo Mine)	Joy Desor specimen

Edwardsite

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