Tinsleyite Mineral Data

Tinsleyite Mineral Data +

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.

Synonym:

ICSD 407356

PDF 38-351

Tinsleyite Image

Images:

Tinsleyite Phosphosiderite Rockbridgeite

Comments: Violet botryoidal tinsleyite on bluish-purple botryoidal phosphosiderite on dark, massive rockbridgeite.
Location: Bendada, Guarda, Portugal. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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

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

By Intensity(I/I_o): 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

Diaphaniety:

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

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:

r_electron=2.82 gm/cc
note: r_Tinsleyite=2.82 gm/cc.

Fermion Index

Fermion Index = 0.00026
Boson Index = 0.99974

Photoelectric:

PE_Tinsleyite= 2.53 barns/electron
U=PE_Tinsleyite x r_electron= 7.13 barns/cc.

Radioactivity:

GRapi = 167.84 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Tinsleyite - barely detectable

Tinsleyite Classification

Dana Class:

42.11.6.2 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.6)Dana Group

42.11.6.1 Leucophosphite KFe2(PO4)2(OH)·2(H2O) P 2₁/n 2/m

42.11.6.2 Tinsleyite KAl2(PO4)2(OH)·2(H2O) P 2₁/n 2/m

42.11.6.3 Spheniscidite (NH4,K)(Fe,Al)2(PO4)2(OH)·2(H2O) P 2₁/n 2/m

Strunz Class:

VII/D.27-10 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.27 - Tinsleyite - Minyulite series

VII/D.27-10 Tinsleyite KAl2(PO4)2(OH)·2(H2O) P 2₁/n 2/m

VII/D.27-20 Spheniscidite (NH4,K)(Fe,Al)2(PO4)2(OH)·2(H2O) P 2₁/n 2/m

VII/D.27-30 Leucophosphite KFe2(PO4)2(OH)·2(H2O) P 2₁/n 2/m

VII/D.27-40 Minyulite KAl2(PO4)2(OH,F)·4(H2O) Pba2 mm2

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 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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Tinsleyite

KAl2(PO4)2(OH)·2(H2O)
Dana No: 42.11.6.2 Strunz No: VII/D.27-10
Locality:

Notes: