Johnbaumite Mineral Data

Johnbaumite Mineral Data +

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General Johnbaumite Information

Chemical Formula:

Ca5(AsO4)3(OH)

Composition:

Molecular Weight = 634.15 gm

Calcium 31.60 % Ca 44.21 % CaO

Arsenic 35.44 % As 54.37 % As₂O₅

Hydrogen 0.16 % H 1.42 % H₂O

Oxygen 32.80 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₅(AsO₄)₃(OH)

Environment:

As analog of hydroxylapatite and (OH) analog of svabite.

IMA Status:

Approved IMA 1980

Locality:

Palmer Shaft, Franklin mine, Franklin, Sussex County, New Jersey, USA. Link to MinDat.org Location Data.

Name Origin:

Named for John L. Baum (1916-), resident geologist of the New Jersey Zinc Co. and curator of the Franklin Mineral Museum, Franklin, New Jersey, USA.

Johnbaumite Image

Images:

Johnbaumite Tephroite

Comments: Violet crystalline massive johnbaumite with brown tephroite.
Location: Jacobsberg, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Johnbaumite Crystallography

Axial Ratios:

a:c = 1:0.71443

Cell Dimensions:

a = 9.7, c = 6.93, Z = 2; V = 564.69 Den(Calc)= 3.73

Crystal System:

HexagonalSpace Group: P 6₃/m,P 6₃

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

By Intensity(I/I_o): 2.895(1), 2.798(0.7), 2.82(0.7),

Physical Properties of Johnbaumite

Cleavage:

[1010] Distinct

Color:

Colorless, White.

Density:

3.65

Diaphaniety:

Transparent

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

4.5 - Between Fluorite and Apatite

Luminescence:

Fluorescent, Short UV=pink orange.

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Johnbaumite

Dichroism (e):

colorless.

Dichroism (w):

colorless.

Gladstone-Dale:

CI meas= -0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1838,KPDmeas= 0.1878,KC= 0.1858

Optical Data:

Uniaxial (-), e=1.684, w=1.687, bire=0.0030.

Calculated Properties of Johnbaumite

Electron Density:

r_electron=3.58 gm/cc
note: r_Johnbaumite=3.73 gm/cc.

Fermion Index

Fermion Index = 0.00058
Boson Index = 0.99942

Photoelectric:

PE_Johnbaumite= 27.96 barns/electron
U=PE_Johnbaumite x r_electron= 100.01 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Johnbaumite is Not Radioactive

Johnbaumite Classification

Dana Class:

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

(41.8)where (A)5 (XO4)3 Zq

(41.8.3)Dana Group

41.8.3.1 Svabite Ca5(AsO4)3F P 6₃/m 6/m

41.8.3.2 Turneaureite Ca5[(As,P)O4]3Cl P 6₃/m 6/m

41.8.3.3 Johnbaumite Ca5(AsO4)3(OH) P 6₃/m,P 6₃ Hex

41.8.3.4 Fermorite (Ca,Sr)5(AsO4,PO4)3(OH) P 6₃/m 6/m

Strunz Class:

VII/B.39-80 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.39 - Apatite - Pyromorphite group

VII/B.39-10 Fluorapatite Ca5(PO4)3F P 6₃/m 6/m

VII/B.39-20 Chlorapatite Ca5(PO4)3Cl P 6₃/m 6/m

VII/B.39-30 Hydroxylapatite Ca5(PO4)3(OH) P 6₃/m 6/m

VII/B.39-40 Carbonate-hydroxylapatite Ca5(PO4,CO3)3(OH) P 6₃/m 6/m

VII/B.39-50 Carbonate-fluorapatite Ca5(PO4,CO3)3F P 6₃/m 6/m

VII/B.39-60 Svabite Ca5(AsO4)3F P 6₃/m 6/m

VII/B.39-70 Turneaureite Ca5[(As,P)O4]3Cl P 6₃/m 6/m

VII/B.39-80 Johnbaumite Ca5(AsO4)3(OH) P 6₃/m,P 6₃ Hex

VII/B.39-90 Fermorite (Ca,Sr)5(AsO4,PO4)3(OH) P 6₃/m 6/m

VII/B.39-95 Fluorcaphite! (Ca,Sr,Ce,Na)5(PO4)3F P 6₃ 6

VII/B.39-100 Strontium-apatite (Sr,Ca)5(PO4)3(F,OH) P 6₃/m 6/m

VII/B.39-110 Belovite-(Ce) (Sr,Ce,Na,Ca)5(PO4)3(OH) P 3 3

VII/B.39-115 Belovite-(La)! (Sr,La,Ce,Ca)5(PO4)3(F,OH) P 3 3

VII/B.39-117 Kuannersuite-(Ce)! Ba6Na2REE2(PO4)6FCl P 3 3

VII/B.39-120 Alforsite Ba5(PO4)3Cl P 6₃/m 6/m

VII/B.39-130 Morelandite (Ba,Ca,Pb)5(AsO4,PO4)3Cl P 6₃/m,P 6₃ Hex

VII/B.39-140 Hedyphane Ca2Pb3(AsO4)3Cl P 6₃/m 6/m

VII/B.39-150 Pyromorphite Pb5(PO4)3Cl P 6₃/m 6/m

VII/B.39-160 Mimetite Pb5(AsO4)3Cl P 6₃/m 6/m

VII/B.39-165 Clinomimetite Pb5(AsO4)3Cl P 2₁/b 2/m

VII/B.39-170 Vanadinite Pb5(VO4)3Cl P 6₃/m 6/m

Other Johnbaumite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Johnbaumite

Ca5(AsO4)3(OH)
Dana No: 41.8.3.3 Strunz No: VII/B.39-80
Locality:

Notes: