Roweite Mineral Data

Roweite Mineral Data +

General Roweite Information

Chemical Formula:

Ca2Mn++2B4O7(OH)6

Composition:

Molecular Weight = 447.31 gm

Calcium 17.92 % Ca 25.07 % CaO

Manganese 24.56 % Mn 31.72 % MnO

Boron 9.67 % B 31.13 % B₂O₃

Hydrogen 1.35 % H 12.08 % H₂O

Oxygen 46.50 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂Mn²⁺₂B₄O₇(OH)₆

IMA Status:

Valid Species (Pre-IMA) 1937

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 6172

PDF 26-1065

Roweite Image

Images:

Roweite

Comments: Pinkish nodular massive roweite.
Location: Solongo, Republic of Buryatia, Siberia, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Roweite Crystallography

Axial Ratios:

a:b:c =0.678:1:0.6205

Cell Dimensions:

a = 9.057, b = 13.357, c = 8.289, Z = 4; V = 1,002.76 Den(Calc)= 2.96

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbam

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.974(1), 2.6(0.72), 2.184(0.49),

Crystal Structure:

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Moore P B , Araki T , American Mineralogist , 59 (1974) p.60-65, Roweite, Ca2Mn2(OH)4[B4O7(OH)2]: Its atomic arrangement

Physical Properties of Roweite

Cleavage:

[001] Indistinct, [021] Indistinct, [100] Distinct

Color:

Light brown.

Density:

2.935

Diaphaniety:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

light brown

Optical Properties of Roweite

Gladstone-Dale:

CI meas= 0 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2212,KPDmeas= 0.2231,KC= 0.2231

Optical Data:

Biaxial (-), a=1.646, b=1.658, g=1.66, bire=0.0140, 2V(Calc)=44, 2V(Meas)=28.

Calculated Properties of Roweite

Electron Density:

r_electron=2.89 gm/cc
note: r_Roweite=2.94 gm/cc.

Fermion Index

Fermion Index = 0.0197
Boson Index = 0.9803

Photoelectric:

PE_Roweite= 8.54 barns/electron
U=PE_Roweite x r_electron= 24.65 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Roweite is Not Radioactive

Roweite Classification

Dana Class:

25.4.1.1 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.4)Dana Type

(25.4.1)Dana Group

25.4.1.1 Roweite Ca2Mn2B4O7(OH)6 Pbam 2/m 2/m 2/m

25.4.1.2 Fedorovskite Ca2(Mg,Mn)2B4O7(OH)6 Pbam 2/m 2/m 2/m

Strunz Class:

V/H.11-20 V - Nitrates, Carbonates and Borates

V/H - Group borates. Planary and tetrahedral groups [B3O5]1- to [B6O10]2-

V/H.11 - Fedorovskite - Roweite series

V/H.11-10 Fedorovskite Ca2(Mg,Mn)2B4O7(OH)6 Pbam 2/m 2/m 2/m

V/H.11-20 Roweite Ca2Mn2B4O7(OH)6 Pbam 2/m 2/m 2/m

Other Roweite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Roweite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Print or Cut-and-Paste your Roweite Specimen Label here :

Roweite

Ca2Mn++2B4O7(OH)6
Dana No: 25.4.1.1 Strunz No: V/H.11-20
Locality:

Notes: