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Roweite

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Formula:
Ca2Mn22+B4O7(OH)6
System:
Orthorhombic
Colour:
Light brown; colourless ...
Hardness:
5
Name:
Named in 1937 by Harry Berman and Forest A. Gonyer in honor of Mr. George Rowe [1868 Cornwall, England, United Kingdom - 1947 USA], Mine Captain and mineral collector, of Franklin, New Jersey, USA.
Fedorovskite-Roweite Series. The manganese analogue of Fedorovskite.

Only one specimen known is known from the type locality (all additional specimens are "crumbs" from the original single specimen).

Classification of Roweite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
6.DA.25

6 : BORATES
D : Tetraborates
A : Neso-tetraborates
25.4.1.1

25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
4 : Tetraborates
9.4.1

9 : Borates
4 : Borates of Ca and Mn
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First Recorded Occurrence of Roweite

Year of Discovery:
1937
Geological Setting of First Recorded Material:
Hydrothermal veinlets transversing Precambrian metamorphosed Zn-Mn-Fe orebody (Franklin, NJ).
Associated Minerals at First Recorded Locality:

Physical Properties of Roweite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Light brown; colourless in transmitted light
Hardness (Mohs):
5
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
On {101}

Crystallography of Roweite

Crystal System:
Orthorhombic
Cell Parameters:
a = 9.05Å, b = 13.35Å, c = 8.28Å
Ratio:
a:b:c = 0.678 : 1 : 0.62
Unit Cell Volume:
V 1,000.37 ų (Calculated from Unit Cell)
Morphology:
Crystals rough, lath-shaped, flattened {010} and elongated [001]. Terminations not measurable.

Optical Data of Roweite

Type:
Biaxial (-)
RI values:
nα = 1.646 nβ = 1.658 nγ = 1.660
2V:
Measured: 28° , Calculated: 44°
Max Birefringence:
δ = 0.014
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
weak

Chemical Properties of Roweite

Formula:
Ca2Mn22+B4O7(OH)6
Essential elements:
All elements listed in formula:

Relationship of Roweite to other Species

Series:
Forms a series with Fedorovskite (see here)
6.DA.10BoraxNa2(B4O5)(OH)4 · 8H2O
6.DA.15TincalconiteNa2(B4O7) · 5H2O
6.DA.20HungchaoiteMg(B4O7) · 9H2O
6.DA.25FedorovskiteCa2Mg2B4O7(OH)6
6.DA.30HydrochlorboriteCa4B8O15Cl2 · 21H2O
6.DA.35UralboriteCa2[B3O3(OH)5 · OB(OH)3]
6.DA.40BorcariteCa4Mg(B4O6(OH)6)(CO3)2
6.DA.40NumanoiteCa4Cu(B4O6(OH)6)(CO3)2
6.DA.60Fontarnauite(Na,K)2(Sr,Ca) (SO4)[B5O8(OH)]·2H2O

Other Names for Roweite

Name in Other Languages:
German:Roweit
Russian:Ровеит
Spanish:Roweita

Other Information

Other Information:
Readily soluble in dilute HCl.
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 Roweite

Reference List:
Berman and Gonyer (1937) American Mineralogist: 22: 301-303.

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. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 377-378.

American Mineralogist (1974): 59: 60-65.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for Roweite

Localities for Roweite

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.
Russia
 
  • Eastern-Siberian Region
    • Transbaikalia (Zabaykalye)
      • Buriatia Republic (Buryatia)
        • Vitim Plateau
Nikita Chukanov (IR- and EDS-analyses)
USA
 
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Franklin
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: 378; Dunn(1995):Pt5:641-642.
Mineral and/or Locality  
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