Gamagarite Mineral Data +

Fabre Minerals

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: Mouse drag1 - LMB Manipulate Structure drag2 - RMB Resize/Rotate Keyboard S - Stereo Pair on/off H - Help Screen I - Data Info A - Atoms On/Off P - Polyhedra On/Off B - Bonds On/Off Help on Above	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:	relectron=4.15 gm/cc note: rGamagarite =4.67 gm/cc.
Fermion Index	Fermion Index = 0.0869 Boson Index = 0.9131
Photoelectric:	PEGamagarite = 221.06 barns/electron U=PEGamagarite x relectron= 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 Search for Gamagarite using:   Web webmineral.com [ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO] Visit our Advertisers for Gamagarite : AA Mineral Specimens B & L Fine Minerals Crystal Vaults Dan Weinrich Fine Minerals Dan Weinrich Auctions e-Rocks Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals Rockshop.cz T G Fine Minerals Wrights Rock Shop Translate Gamagarite Mineral Data : Ask about Gamagarite here : Ask-A-Mineralogist from the Mineralogical Society of America Mindat.org's Discussion Groups Original Rockhounds Discussion Group Rockhounds Discussion Group on Yahoo Groups Mineral Discussion Forum from Fabre Minerals - also available in Español Print or Cut-and-Paste your Gamagarite Specimen Label here : Gamagarite Ba2(Fe+++,Mn+++)(VO4)2(OH) Dana No: 41.10.4.3 Strunz No: VII/B.24-20 Locality:   Notes: