Tinsleyite Mineral Data (original) (raw)
General Tinsleyite Information
Chemical Formula:
KAl2(PO4)2(OH)•2(H2O)
Composition:
Molecular Weight = 336.04 gm
Potassium 11.63 % K 14.02 % K2O
Aluminum 16.06 % Al 30.34 % Al2O3
Phosphorus 18.43 % P 42.24 % P2O5
Hydrogen 1.50 % H 13.40 % H2O
Oxygen 52.37 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
KAl2(PO4)2(OH)•2(H2O)
Environment:
Found in highly altered triphylite pods in the intermediate zone of the pegmatite.
IMA Status:
Approved IMA 1984
Locality:
Tip Top pegmatite, 8.8 km SE of Custer, Custer County, South Dakota, USA. Link to MinDat.org Location Data.
Name Origin:
Named for Frank C. Tinsley (1916-), mineral collector, Black Hills specialist of Rapid City, South Dakota, USA.
Name Pronunciation:
Tinsleyite + Pronunciation 
Synonym:
ICSD 407356
PDF 38-351
Tinsleyite Image
Images:
Tinsleyite Crystallography
Axial Ratios:
a:b:c =1.0073:1:0.5815
Cell Dimensions:
a = 9.602, b = 9.532, c = 5.543, Z = 2.5; beta = 103.16° V = 494.01 Den(Calc)= 2.82
Crystal System:
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/n
X Ray Diffraction:
By Intensity(I/Io): 6.68(1), 5.91(0.8), 3.006(0.7),
Crystal Structure:
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| | Dick S , Zeitschrift fur Naturforschung , B54 (1999) p.1385-1390, Uber die struktur von synthetischem tinsleyit K[Al2(PO4)2(OH)(H2O)]*(H2O), Locality: synthetic | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
Physical Properties of Tinsleyite
Cleavage:
None
Color:
Dark red.
Density:
2.69
Diaphaneity:
Translucent
Fracture:
Brittle - Uneven - Very brittle fracture producing uneven fragments.
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
5 - Apatite
Luster:
Vitreous (Glassy)
Streak:
pink
Optical Properties of Tinsleyite
Gladstone-Dale:
CI meas= -0.042 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2118,KPDmeas= 0.2221,KC= 0.2131
Ncalc = 1.57 - 1.6
Optical Data:
Biaxial (+), a=1.591, b=1.597, g=1.604, bire=0.0130, 2V(Calc)=86, 2V(Meas)=86.
Pleochroism (x):
pale orange.
Pleochroism (y):
light purple.
Pleochroism (z):
dark purplish red.
Calculated Properties of Tinsleyite
Electron Density:
Bulk Density (Electron Density)=2.82 gm/cc
note: Specific Gravity of Tinsleyite =2.82 gm/cc.
Fermion Index:
Fermion Index = 0.0002675992
Boson Index = 0.9997324008
Photoelectric:
PETinsleyite = 2.53 barns/electron
U=PETinsleyite x relectron= 7.13 barns/cc.
Radioactivity:
GRapi = 167.84 (Gamma Ray American Petroleum Institute Units)
Concentration of Tinsleyite per GRapi unit = 0.60 (%)
Estimated Radioactivity from Tinsleyite 
- barely detectable
Tinsleyite Classification
Dana Class:
42.11.06.02 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
(42.11)where (AB)4 (XO4)3 Zq � x(H2O)
(42.11.06)Leucophosphite Group
42.11.06.01 Leucophosphite KFe2(PO4)2(OH)•2(H2O) P 21/n 2/m
42.11.06.02 Tinsleyite KAl2(PO4)2(OH)•2(H2O) P 21/n 2/m
42.11.06.03 Spheniscidite (NH4,K)(Fe,Al)2(PO4)2(OH)•2(H2O) P 21/n 2/m
Strunz Class:
08.DH.10 08 - PHOSPHATES, ARSENATES, VANADATES
08.D - Phosphates, etc
08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1
08.DH.10 Leucophosphite KFe2(PO4)2(OH)•2(H2O) P 21/n 2/m
08.DH.10 Spheniscidite (NH4,K)(Fe,Al)2(PO4)2(OH)•2(H2O) P 21/n 2/m
08.DH.10 Tinsleyite KAl2(PO4)2(OH)•2(H2O) P 21/n 2/m
Other Tinsleyite Information
References:
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
See Also:
Links to other databases for Tinsleyite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
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Ask about Tinsleyite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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Print or Cut-and-Paste your Tinsleyite Specimen Label here :
Tinsleyite
KAl2(PO4)2(OH)•2(H2O)
Dana No: 42.11.06.02 Strunz No: 08.DH.10
Locality:
Notes: