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Schröckingerite

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Isolagrande mine, Isolagrande, Murialdo, Savona Province, Liguria, Italy
© Elmar Lackner 2009

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Formula:
NaCa
 
3
(UO
 
2
)[F|(CO
 
3
)
 
3
|SO
 
4
] · 10H
 
2
O
System:OrthorhombicColour:Greenish yellow
Hardness:2½
Name:Named after Baron J von Schröckinger who found, and later described, the mineral as an alteration product of uraninite.
This page provides mineralogical data about Schröckingerite.

Classification of Schröckingerite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:6/D.21-20
Nickel-Strunz 10th (pending) edition ID:5.EG.05

5 : CARBONATES (NITRATES)
E : Uranyl Carbonates
G : With SO4 or SiO4
Dana 8th edition ID:17.1.5.1

17 : COMPOUND CARBONATES
1 : Miscellaneous
Hey's CIM Ref.:12.2.18

12 : Carbonates with other anions
2 : Carbonates with sulphate
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Type Occurrence of Schröckingerite

Type Locality:Svornost Mine (Einigkeit Mine), Jáchymov (St Joachimsthal), Ostrov, Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic

Physical Properties of Schröckingerite

Lustre:Sub-Vitreous, Pearly
Diaphaneity (Transparency):Transparent
Colour:Greenish yellow
Hardness (Mohs):2½
Cleavage:Perfect
On {0001}.
Density (measured):2.51 g/cm3

Crystallography of Schröckingerite

Crystal System:Orthorhombic
Morphology:Scaly crystals flattened on {0001}, sometimes with a six-sided outline and interfacial angles of about 60°, as clusters or spherical aggregates.

Optical Data of Schröckingerite

Type:Biaxial (-)
RI values: nα = 1.495 nβ = 1.543 nγ = 1.544
Maximum Birefringence:δ = 0.049

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:weak

Chemical Properties of Schröckingerite

Formula:
NaCa
 
3
(UO
 
2
)[F|(CO
 
3
)
 
3
|SO
 
4
] · 10H
 
2
O
Essential elements:C, Ca, F, H, Na, O, S, U
All elements listed in formula:C, Ca, F, H, Na, O, S, U

Relationship of Schröckingerite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
5.EG.05UM1997-27-CO:CaHKSU
Ca, K, Mg, U, S(?)
5.EG.10Lepersonnite-(Gd)
Ca(Gd,Dy)
 
2
[(UO
 
2
)
 
6
(OH)
 
6
(CO
 
3
)
 
2
(SiO
 
4
)]
 
4
 ·48(H
 
2
O)
Related Minerals - Hey's Index Grouping:

- +
12.2.1Burkeite
Na
 
6
CO
 
3
(SO
 
4
)
 
2
12.2.2Hanksite
Na
 
22
K(SO
 
4
)
 
9
(CO
 
3
)
 
2
Cl
12.2.3Tychite
Na
 
6
Mg
 
2
SO
 
4
(CO
 
3
)
 
4
12.2.4Motukoreaite
NaMg
 
19
Al
 
12
(CO
 
3
)
 
6.5
(SO
 
4
)
 
4
(OH)
 
54
·28H
 
2
O
12.2.5Ferrotychite
Na
 
6
(Fe,Mn,Mg)
 
2
SO
 
4
(CO
 
3
)
 
4
12.2.6Nakauriite
Cu
 
8
[(OH)
 
6
|CO
 
3
|(SO
 
4
)
 
4
] · 48H
 
2
O
12.2.7Carbonatecyanotrichite
Cu
 
4
Al
 
2
[(OH)
 
12
|(CO
 
3
,SO
 
4
)] · 2H
 
2
O
12.2.8Rapidcreekite
Ca
 
2
[CO
 
3
|SO
 
4
] · 4H
 
2
O
12.2.9Tatarskite
Ca
 
6
Mg
 
2
(SO
 
4
)
 
2
(CO
 
3
)
 
2
Cl
 
4
(OH)
 
4
·7H
 
2
O
12.2.10Schulenbergite
(Cu,Zn)
 
7
[(OH)
 
10
|(SO
 
4
,CO
 
3
)
 
2
] · 3H
 
2
O
12.2.11Leadhillite
Pb
 
4
SO
 
4
(CO
 
3
)
 
2
(OH)
 
2
12.2.12Macphersonite
Pb
 
4
SO
 
4
(CO
 
3
)
 
2
(OH)
 
2
12.2.13Susannite
Pb
 
4
SO
 
4
(CO
 
3
)
 
2
(OH)
 
2
12.2.14Wherryite
Pb
 
7
Cu
 
2
(SO
 
4
)
 
4
(SiO
 
4
)
 
2
(OH)
 
2
12.2.15Caledonite
Cu
 
2
Pb
 
5
[(OH)
 
6
|CO
 
3
|(SO
 
4
)
 
3
]
12.2.16Nasledovite
PbMn
 
3
Al
 
4
(CO
 
3
)
 
4
SO
 
4
O
 
5
·5H
 
2
O
12.2.17Jouravskite
Ca
 
6
Mn
3+
2
[(OH)
 
4
|(SO
 
4
,CO
 
3
)]
 
3
 · 26H
 
2
O
12.2.19Manganotychite
Na
 
6
Mn
 
2
SO
 
4
(CO
 
3
)
 
4
12.2.20Hauckite
Fe
3+
3
(Mg,Mn
2+
 
)
 
24
Zn
 
18
[(OH)
 
81
|(CO
 
3
)
 
2
|(SO
 
4
)
 
4
]
12.2.21Paraotwayite
Ni(OH)
 
2-x
(SO
 
4
,CO
 
3
)
 
0.5x
12.2.22Carrboydite
(Ni,Cu)
 
14
Al
 
9
[(OH)
 
43
|(SO
 
4
,CO
 
3
)
 
6
] · 7H
 
2
O
12.2.23Mountkeithite
(Mg,Ni)
 
11
(Fe
3+
 
,Cr
3+
 
,Al)
 
3
[(OH)
 
24
|(SO
 
4
,CO
 
3
)
 
3.5
] · 11H
 
2
O
12.2.24Camerolaite
Cu
 
4
Al
 
2
[(OH)
 
10
|CO
 
3
|(HSbO
 
4
,SO
 
4
)] · 2H
 
2
O

Other Names for Schröckingerite

Synonyms:
DakeiteNeogastuniteSchröckeringeriteSchröckeringiteSchröckinergite
Schroeckingerite
Other Languages:
German:Dakeit
Neogastunit
Schröckeringerit
Schröckeringit
Schröckinergit
Schröckingerit
Schroeckingerit
Russian:Шрекингерит
Spanish:Dakeita
Neogastunita
Schröckeringerita
Schröckeringita
Schröckinergita
Schröckingerita
Schroeckingerita

Other Information

Fluorescence in UV light:Yellow-green fluorescence.
Other Information:Soluble in water and in acids.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Schröckingerite

Reference List:Schrauf (1873) Mineralogische und petrographische Mitteilungen, Vienna: 137.

Schroeckinger (1875) Geol. Reichsanst., Wien, Verh.: 66.

Larsen and Gonyer (1937) American Mineralogist: 22: 561 (as Dakeite).

Nováček (1939) American Mineralogist: 24: 317.

Sherwood analysis in: Jaffe, et al (1948) American Mineralogist: 33: 152-157.

Grimaldi analysis in: Axelrod, et al (1951) American Mineralogist: 36: 1.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 236.

American Mineralogist (1959): 44: 1020-1025.

Mereiter, K. (1986a) Crystal structure and crystallographic properties of a schröckingerite from Joachimsthal. Tschermaks Mineralogische und Petrographische Mitteilungen (1986): 35: 1-18.

Li, Y., Krivovichev, S.V., and Burns, P.C. (2001a) The crystal structure of Na4(UO2)(CO3)3 and its relationship to schröckingerite. Mineralogical Magazine: 65: 297-304.

Burns, P.C. (2005) U 6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.

Internet Links for Schröckingerite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Schröckingerite in the Natural History Museum (London) online catalogue
  • Schröckingerite details from Handbook of Mineralogy (PDF)
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    Localities for Schröckingerite

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