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Sclarite

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Formula:
(Zn,Mg,Mn
2+
 
)
 
4
Zn
 
3
(CO
 
3
)
 
2
(OH)
 
10
System:MonoclinicColour:Colourless, light gray ...
Hardness:3 - 4
Name:Named in 1989 by Joel Denison Grice and Pete J. Dunn in honor of Dr. Charles Bertram Sclar [March 16, 1925 Newark, New Jersey, USA - January 13, 2001 Bethlehem, Northampton County, Pennsylvania, USA], Professor of Geology, Lehigh University, Bethlehem, Pennsylvania, U.S.A. Dr. Sclar was a specialist in high pressure metamorphic pertology, was a chief scientist to research the lunar petrology specimens collected on Apollo missions, and was a researcher of the Franklin - Ogdensburg ore deposits.
Isostructural with:Loseyite


Sclarite occurs in small (<1mm) bright white crystal clusters. At low magnification, the sclarite appears smoothly spherical, but the crystals in the clusters distinctly project out of the spherical grouping at varying lengths. Relatively smooth spherical clusters of gray white calcite/rhodochrosite are often present. Sclarite has been observed only in the distinctive and essential association with lilac to purple gageite fibrous crystals.

Classification of Sclarite

IMA status:Approved 1988
Strunz 8th edition ID:5/C.01-130
Nickel-Strunz 10th (pending) edition ID:5.BA.30

5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
A : With Cu, Co, Ni, Zn, Mg, Mn
Dana 8th edition ID:16a.5.3.2

16a : ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
5 : Miscellaneous
Hey's CIM Ref.:11.6.9

11 : Carbonates
6 : Carbonates of Zn and Cd
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Type Occurrence of Sclarite

Type Locality:Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
General Appearance of Type Material:Tiny slender bladed crystals or spherules with terminations creating a rough surface.
Year of Discovery:1988
Geological Setting of type material:Etched veinlets in calcite - willemite - franklinite ore.
Associated Minerals at type locality:
ZinciteWillemiteRhodochrositeLeucophoeniciteGageite
Chlorophoenicite

Physical Properties of Sclarite

Lustre:Resinous, Waxy, Greasy
Diaphaneity (Transparency):Translucent
Colour:Colourless, light gray in aggregates
Streak:White
Hardness (Mohs):3 - 4
Tenacity:Brittle
Cleavage:None Observed
Density (measured):3.51 g/cm3
Density (calculated):3.55 g/cm3

Crystallography of Sclarite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/b {B1 1 2/b} {C2/c} {C1 2/c 1}
Cell Parameters:a = 16.110Å, b = 5.432Å, c = 15.041Å
β = 95.49°
Ratio:a:b:c = 2.966 : 1 : 2.769
Unit Cell Volume:V 1,310.19 ų (Calculated from Unit Cell)
Z:4
Morphology:Flattened on {001}, elongated to {010}; Form {100} is generally small.
Comment:A2/a
X-Ray Powder Diffraction:
d-spacingIntensity
7.50 (100)
5.23 (20)
4.82 (20)
3.75 (40)
3.63 (50)
3.53 (40)
2.62 (50)
2.50 (40)

Optical Data of Sclarite

Type:Biaxial (+)
RI values: nα = 1.648 nβ = 1.664 nγ = 1.702
2V:Measured: 63° to 67°, Calculated: 68°
Birefringence:0.054
Maximum Birefringence:δ = 0.054

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v strong
Optical Extinction:Y=b, X^c = 49°
Pleochroism:Non-pleochroic

Chemical Properties of Sclarite

Formula:
(Zn,Mg,Mn
2+
 
)
 
4
Zn
 
3
(CO
 
3
)
 
2
(OH)
 
10
Simplified for copy/paste:(Zn,Mg,Mn2+)4Zn3(CO3)2(OH)10
Essential elements:C, H, O, Zn
All elements listed in formula:C, H, Mg, Mn, O, Zn

Relationship of Sclarite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
5.BA.05Azurite
Cu
 
3
(CO
 
3
)
 
2
(OH)
 
2
5.BA.10Georgeite
Cu
 
2
(CO
 
3
)(OH)
 
2
· 6H
 
2
O
5.BA.10Glaukosphaerite
(Cu,Ni)
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Kolwezite
(Cu,Co)
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Malachite
Cu
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Mcguinnessite
(Mg,Cu)
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Nullaginite
Ni
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Pokrovskite
Mg
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Rosasite
(Cu,Zn)
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Zincrosasite
(Zn,Cu)
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Chukanovite
Fe
2+
2
(CO
 
3
)(OH)
 
2
5.BA.15Aurichalcite
(Zn,Cu)
 
5
(CO
 
3
)
 
2
(OH)
 
6
5.BA.15Hydrozincite
Zn
 
5
(CO
 
3
)
 
2
(OH)
 
6
5.BA.20Holdawayite
Mn
 
6
(CO
 
3
)
 
2
(OH)
 
7
(Cl,OH)
5.BA.25Defernite
Ca
 
6
(CO
 
3
)
 
2-x
(SiO
 
4
)
 
x
(OH)
 
7
(Cl,OH)
 
1-2x
(x<0.5)
5.BA.25UM1977-03-COSiO:CaClH
Ca
 
10
(SiO
 
4
)(CO
 
3
)
 
7
(Cl,OH)
 
2
5.BA.30Loseyite
(Mn
2+
 
,Zn,Mg)
 
4
Zn
 
3
(CO
 
3
)
 
2
(OH)
 
10
Related Minerals - Hey's Index Grouping:

- +
11.6.1Smithsonite
ZnCO
 
3
11.6.2Hydrozincite
Zn
 
5
(CO
 
3
)
 
2
(OH)
 
6
11.6.3Rosasite
(Cu,Zn)
 
2
(CO
 
3
)(OH)
 
2
11.6.4Zincrosasite
(Zn,Cu)
 
2
(CO
 
3
)(OH)
 
2
11.6.5Aurichalcite
(Zn,Cu)
 
5
(CO
 
3
)
 
2
(OH)
 
6
11.6.6Claraite
(Cu,Zn)
 
3
(CO
 
3
)(OH)
 
4
· 4H
 
2
O
11.6.7Minrecordite
CaZn(CO
 
3
)
 
2
11.6.8Loseyite
(Mn
2+
 
,Zn,Mg)
 
4
Zn
 
3
(CO
 
3
)
 
2
(OH)
 
10
11.6.10Otavite
CdCO
 
3

Other Names for Sclarite

Synonyms:
IMA1988-026
Other Languages:
German:Sclarit
Russian:Склярит
Spanish:Sclarita

Other Information

IR Spectrum:Not fluorescent
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 Sclarite

Reference List:

- +
Grice, J. D. & Dunn, P. J. (1989): Sclarite, a new mineral from Franklin, New Jersey, with essential octahedrally and tetrahedrally coordinated zinc: Description and structure refinement. American Mineralogist: 74: 1355-1359.

Internet Links for Sclarite

Search Engines:
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  • External Links:
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  • Look for Sclarite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Sclarite details from Handbook of Mineralogy (PDF)
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  • Localities for Sclarite

    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Greece
     
    • Attikí Prefecture (Attica; Attika)
      • Lavrion District (Laurion; Laurium)
        • Lavrion District Mines
          • Agios Konstantinos [St Constantine] (Kamariza)
            • Kamariza Mines (Kamareza Mines)
    Schnorrer, G. (2004): Mineralogische Notizen VIII. Der Aufschluss, 55 (6), 381-384.
    Poland
     
    • Małopolskie
      • Olkusz District
        • Bolesław
    Coppola, V., Boni, M., Gilg, A., and Strzelska-Smakowska, B. (2009): Mineralium Deposita 44, 559-580.
    USA
     
    • New Jersey
      • Sussex Co.
        • Franklin Mining District
          • Franklin
    Dunn, P.J.: Min.Rec.:17:126-127 (1986); Dunn(1995):Pt4:624-625.
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