Gamagarite Mineral Data

Gamagarite Mineral Data +

General Gamagarite Information

Chemical Formula:

Ba2(Fe+++,Mn+++)(VO4)2(OH)

Composition:

Molecular Weight = 577.16 gm

Barium 47.59 % Ba 53.13 % BaO

Manganese 2.38 % Mn 3.42 % Mn₂O₃

Vanadium 17.65 % V 31.51 % V₂O₅

Iron 7.26 % Fe 10.38 % Fe₂O₃

Hydrogen 0.17 % H 1.56 % H₂O

Oxygen 24.95 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ba₂Fe³⁺_0.75Mn³⁺_0.25(VO₄)₂(OH)

IMA Status:

Valid Species (Pre-IMA) 1943

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 68348

PDF 41-1413

Gamagarite Image

Images:

Gamagarite

Comments: Dark red-brown crystalline gamagarite in white calcite.
Location: Molinello Mine, Val Graveglia, Genova, Liguria, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gamagarite Crystallography

Axial Ratios:

a:b:c =1.4829:1:1.2771

Cell Dimensions:

a = 9.15, b = 6.17, c = 7.88, Z = 2; beta = 112.7° V = 410.41 Den(Calc)= 4.67

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

Crystal Structure:

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Basso R , Palenzona A , Zefiro L , Neues Jahrbuch fur Mineralogie, Monatshefte , 1987 (1987) p.295-304, Gamagarite: new occurrence and crystal structure refinement, Locality: a manganese ore deposit at Molinello mine, Val Graveglia, Eastern Liguria, Italy

Physical Properties of Gamagarite

Cleavage:

[001] Distinct, [100] Distinct, [101] Indistinct

Color:

Brownish black, Dark brown, Black.

Density:

4.62

Diaphaniety:

Translucent to Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

4.5-5 - Near Apatite

Luster:

Adamantine

Optical Properties of Gamagarite

Gladstone-Dale:

CI meas= -0.029 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2274,KPDmeas= 0.2299,KC= 0.2234

Optical Data:

Biaxial (+), a=2.016, b=2.04, g=2.13, bire=0.1140, 2V(Calc)=58, 2V(Meas)=46-62.

Calculated Properties of Gamagarite

Electron Density:

r_electron=4.15 gm/cc
note: r_Gamagarite=4.67 gm/cc.

Fermion Index

Fermion Index = 0.0869
Boson Index = 0.9131

Photoelectric:

PE_Gamagarite= 221.06 barns/electron
U=PE_Gamagarite x r_electron= 918.50 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gamagarite is Not Radioactive

Gamagarite Classification

Dana Class:

41.10.4.3 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.10)where (A++ B++)3 (XO4)2 Zq

(41.10.4)Dana Group

41.10.4.1 Goedkenite (Sr,Ca)2Al(PO4)2(OH) P 2₁/m 2/m

41.10.4.2 Bearthite Ca2Al(PO4)2(OH) P 2₁/m 2/m

41.10.4.3 Gamagarite Ba2(Fe,Mn)(VO4)2(OH) P 2₁/m 2/m

41.10.4.4 Tokyoite! Ba2Mn(VO4)2(OH) P 2₁/m 2/m

Strunz Class:

VII/B.24-20 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.24 - Brackebuschite - Tsumebite group, Bearthite - Jamesite series

VII/B.24-05 Bearthite Ca2Al(PO4)2(OH) P 2₁/m 2/m

VII/B.24-10 Goedkenite (Sr,Ca)2Al(PO4)2(OH) P 2₁/m 2/m

VII/B.24-20 Gamagarite Ba2(Fe,Mn)(VO4)2(OH) P 2₁/m 2/m

VII/B.24-22 Tokyoite! Ba2Mn(VO4)2(OH) P 2₁/m 2/m

VII/B.24-25 Bushmakinite! Pb2Al(PO4)(VO4)(OH) P 2₁/m 2/m

VII/B.24-28 Calderonite! Pb2Fe(VO4)2(OH) P 2₁/m 2/m

VII/B.24-30 Brackebuschite Pb2(Mn,Fe)(VO4)2(OH) P 2₁/m 2/m

VII/B.24-40 Arsenbrackebuschite Pb2(Fe,Zn)(AsO4)2·(H2O) P 2₁/m 2/m

VII/B.24-45 Feinglosite! Pb2(Zn,Fe)[(As,S)O4]2·(H2O) P 2₁,P 2₁/m Mono

VII/B.24-50 Tsumebite Pb2Cu(PO4)(SO4)(OH) P 2₁/m 2/m

VII/B.24-60 Arsentsumebite Pb2Cu(AsO4)(SO4)(OH) P 2₁/m 2/m

VII/B.24-65 Lulzacite! Sr2Fe(Fe,Mg)2Al4(PO4)4(OH)10 P1 1

VII/B.24-70 Jamesite Pb2Zn2Fe5(AsO4)5O4 P1 1

Other Gamagarite 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 Gamagarite :
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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Gamagarite

Ba2(Fe+++,Mn+++)(VO4)2(OH)
Dana No: 41.10.4.3 Strunz No: VII/B.24-20
Locality:

Notes: