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Sclarite

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Formula:
(Zn,Mg,Mn2+)4Zn3(CO3)2(OH)10
System:
Monoclinic
Colour:
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:
Sclarite occurs in small (<1mm) colorless crystals in cloudy grayish 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. Spherical clusters of gray white to pale pink calcite/rhodochrosite are often present as are creamy white spherical clusters of Mineral E (Dunn, 1986). Sclarite has been observed only in the distinctive and essential association with fibrous lilac to purple gageite crystals.

Classification of Sclarite

Approved 1988
5/C.01-130
5.BA.30

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

16a : ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
5 : Miscellaneous
11.6.9

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

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 willemite - franklinite ore without calcite.

Physical Properties of Sclarite

Resinous, Waxy, Greasy
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Colourless, light gray in aggregates
Streak:
White
Hardness (Mohs):
3 - 4
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
3.51 g/cm3 (Measured)    3.55 g/cm3 (Calculated)

Crystallography of Sclarite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
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 Data:
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
Max Birefringence:
δ = 0.054
Image 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,Mn2+)4Zn3(CO3)2(OH)10
Essential elements:
All elements listed in formula:

Relationship of Sclarite to other Species

5.BA.05AzuriteCu3(CO3)2(OH)2
5.BA.10GeorgeiteCu2(CO3)(OH)2 · 6H2O
5.BA.10Glaukosphaerite(Cu,Ni)2(CO3)(OH)2
5.BA.10Kolwezite(Cu,Co)2(CO3)(OH)2
5.BA.10MalachiteCu2(CO3)(OH)2
5.BA.10Mcguinnessite(Mg,Cu)2(CO3)(OH)2
5.BA.10NullaginiteNi2(CO3)(OH)2
5.BA.10PokrovskiteMg2(CO3)(OH)2
5.BA.10Rosasite(Cu,Zn)2(CO3)(OH)2
5.BA.10Zincrosasite(Zn,Cu)2(CO3)(OH)2
5.BA.10ChukanoviteFe22+(CO3)(OH)2
5.BA.15Aurichalcite(Zn,Cu)5(CO3)2(OH)6
5.BA.15HydrozinciteZn5(CO3)2(OH)6
5.BA.20HoldawayiteMn6(CO3)2(OH)7(Cl,OH)
5.BA.25DeferniteCa6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x<0.5)
5.BA.25UM1977-03-COSiO:CaClHCa10(SiO4)(CO3)7(Cl,OH)2
5.BA.30Loseyite(Mn2+,Zn,Mg)4Zn3(CO3)2(OH)10
11.6.1SmithsoniteZnCO3
11.6.2HydrozinciteZn5(CO3)2(OH)6
11.6.3Rosasite(Cu,Zn)2(CO3)(OH)2
11.6.4Zincrosasite(Zn,Cu)2(CO3)(OH)2
11.6.5Aurichalcite(Zn,Cu)5(CO3)2(OH)6
11.6.6Claraite(Cu,Zn)3(CO3)(OH)4 · 4H2O
11.6.7MinrecorditeCaZn(CO3)2
11.6.8Loseyite(Mn2+,Zn,Mg)4Zn3(CO3)2(OH)10
11.6.10OtaviteCdCO3

Other Names for Sclarite

Name in Other Languages:
German:Sclarit
Spanish:Sclarita

Other Information

Not fluorescent in UV
IR Spectrum:
Not fluorescent
Health Risks:
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:
Dunn, Pete J. (1986) A New Zinc Magnesium Carbonate and Data for other Unnamed Species from Franklin and Sterling Hill, New Jersey, Mineralogical Record, v. 17, p. 126-127.
Grice, J. D. and 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

Localities for Sclarite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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 (TL)
 
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Franklin
Dunn, P.J.: Min.Rec.:17:126-127 (1986); Dunn(1995):Pt4:624-625.
Mineral and/or Locality  
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