Samuelsonite Mineral Data

Samuelsonite Mineral Data +

General Samuelsonite Information

Chemical Formula:

(Ca,Ba)Ca8(Fe++,Mn)4Al2(PO4)10(OH)2

Composition:

Molecular Weight = 1,653.71 gm

Barium 1.66 % Ba 1.85 % BaO

Sodium 0.14 % Na 0.19 % Na₂O

Strontium 0.53 % Sr 0.63 % SrO

Calcium 19.63 % Ca 27.47 % CaO

Manganese 5.32 % Mn 6.86 % MnO

Aluminum 2.45 % Al 4.62 % Al₂O₃

Iron 8.44 % Fe 10.86 % FeO

Phosphorus 18.36 % P 42.06 % P₂O₅

Hydrogen 0.33 % H 2.94 % H₂O

Oxygen 43.15 % O

______ ______

100.00 % 97.48 % = TOTAL OXIDE

Empirical Formula:

Ba_0.2Sr_0.1Ca_8.1Fe²⁺_2.5Mn²⁺_1.6Na_0.1Al_1.5(PO₄)_9.8(OH)_5.4

Environment:

Secondary mineral in a complex zoned granite pegmatite.

IMA Status:

Approved IMA 1975

Locality:

Palermo #1 mine, near North Groton, Grafton County, New Hampshire, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Peter B. Samuelson (1941-), Rumney New Hampshire, USA.

Synonym:

ICSD 100034

PDF 29-154

Samuelsonite Image

Images:

Samuelsonite

Comments: Transparent crystal of samuelsonite.
Location: Palermo #1 mine, Groton, Grafton Co., New Hampshire, USA. Scale: Picture size 2.2 mm.
© Thomas Witzke / Abraxas-Verlag

Samuelsonite Crystallography

Axial Ratios:

a:b:c =2.7178:1:2.0573

Cell Dimensions:

a = 18.495, b = 6.805, c = 14, Z = 2; beta = 112.75° V = 1,624.94 Den(Calc)= 3.38

Crystal System:

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

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

By Intensity(I/I_o): 3.058(1), 2.657(0.7), 3.032(0.6),

Crystal Structure:

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Moore P B , Araki T , American Mineralogist , 62 (1977) p.229-245, Samuelsonite: its crystal structure and relation to apatite and octacalcium, phosphate

Physical Properties of Samuelsonite

Cleavage:

[001] Good

Color:

Colorless.

Density:

3.353

Diaphaniety:

Transparent

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

5 - Apatite

Luster:

Subadamantine

Streak:

white

Optical Properties of Samuelsonite

Gladstone-Dale:

CI meas= -0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.008 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1933,KPDmeas= 0.1949,KC= 0.1918

Optical Data:

Biaxial (+), a=1.645-1.648, b=1.65-1.655, g=1.655-1.667, bire=0.0100-0.0190, 2V(Calc)=76-88, 2V(Meas)=70-85. Dispersion r < v weak.

Calculated Properties of Samuelsonite

Electron Density:

r_electron=3.32 gm/cc
note: r_Samuelsonite=3.38 gm/cc.

Fermion Index

Fermion Index = 0.00559
Boson Index = 0.99441

Photoelectric:

PE_Samuelsonite= 14.60 barns/electron
U=PE_Samuelsonite x r_electron= 48.47 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Samuelsonite is Not Radioactive

Samuelsonite Classification

Dana Class:

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

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

(41.10.8)Dana Group

41.10.8.1 Samuelsonite (Ca,Ba)Ca8(Fe,Mn)4Al2(PO4)10(OH)2 C 2/m 2/m

Strunz Class:

VII/B.20-30 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.20 - Arrojadite - Samuelsonite series

VII/B.20-10 Arrojadite KNa4CaMn4Fe10Al(PO4)12(OH,F)2 C 2/c 2/m

VII/B.20-20 Dickinsonite KNa4Ca(Mn,Fe)14Al(PO4)12(OH)2 C 2/c 2/m

VII/B.20-25 Sigismundite! (Ba,K,Pb)Na3(Ca,Sr)(Fe,Mg,Mn)14Al(OH)2(PO4)12 C 2/c 2/m

VII/B.20-30 Samuelsonite (Ca,Ba)Ca8(Fe,Mn)4Al2(PO4)10(OH)2 C 2/m 2/m

VII/B.20-40 Nabiasite! BaMn9[(V,As)O4]6(OH)2 P a3 2/m 3

Other Samuelsonite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)

See Also:

Links to other databases for Samuelsonite :
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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Samuelsonite

(Ca,Ba)Ca8(Fe++,Mn)4Al2(PO4)10(OH)2
Dana No: 41.10.8.1 Strunz No: VII/B.20-30
Locality:

Notes: