Samuelsonite Mineral Data

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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.

Name Pronunciation:

Samuelsonite + Pronunciation

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

Diaphaneity:

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
Ncalc = 1.64 - 1.65

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:

Bulk Density (Electron Density)=3.32 gm/cc
note: Specific Gravity of Samuelsonite =3.38 gm/cc.

Fermion Index:

Fermion Index = 0.0055933091
Boson Index = 0.9944066909

Photoelectric:

PE_Samuelsonite= 14.60 barns/electron
U=PE_Samuelsonite x rElectron Density= 48.47 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Samuelsonite is Not Radioactive

Samuelsonite Classification

Dana Class:

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

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

(41.10.08)Dana Group

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

Strunz Class:

08.BF.10 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BF -With medium-sized and large cations, (OH, etc.):RO4 < 0.5:1

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

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 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Samuelsonite

(Ca,Ba)Ca8(Fe++,Mn)4Al2(PO4)10(OH)2
Dana No: 41.10.08.01 Strunz No: 08.BF.10
Locality:

Notes: