Mineralogy Database

Tinsleyite Mineral Data

Search Webmineral :

General Tinsleyite Information

Help on Chemical  Formula: Chemical Formula: KAl2(PO4)2(OH)•2(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: KAl2(PO4)2(OH)•2(H2O)
Help on Environment: Environment: Found in highly altered triphylite pods in the intermediate zone of the pegmatite.
Help on IMA Status: IMA Status: Approved IMA 1984
Help on Locality: Locality: Tip Top pegmatite, 8.8 km SE of Custer, Custer County, South Dakota, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Frank C. Tinsley (1916-), mineral collector, Black Hills specialist of Rapid City, South Dakota, USA.
Help on Name Pronunciation: Name Pronunciation: Tinsleyite + Pronunciation Say TINSLEYITE
Help on Synonym: Synonym: ICSD 407356
  PDF 38-351

Tinsleyite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  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

Help on Axial Ratios: Axial Ratios: a:b:c =1.0073:1:0.5815
Help on Cell Dimensions: Cell Dimensions: a = 9.602, b = 9.532, c = 5.543, Z = 2.5; beta = 103.16° V = 494.01 Den(Calc)= 2.82
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.68(1), 5.91(0.8), 3.006(0.7),

Physical Properties of Tinsleyite

Help on Cleavage: Cleavage: None
Help on Color: Color: Dark red.
Help on Density: Density: 2.69
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: pink

Optical Properties of Tinsleyite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (+), a=1.591, b=1.597, g=1.604, bire=0.0130, 2V(Calc)=86, 2V(Meas)=86.
Help on Pleochroism (x): Pleochroism (x): pale orange.
Help on Pleochroism (y): Pleochroism (y): light purple.
Help on Pleochroism (z): Pleochroism (z): dark purplish red.

Calculated Properties of Tinsleyite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.82 gm/cc
note: Specific Gravity of Tinsleyite =2.82 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0002675992
Boson Index = 0.9997324008
Help on Photoelectric: Photoelectric: PETinsleyite = 2.53 barns/electron
U=PETinsleyite x relectron= 7.13 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.11)where (AB)4 (XO4)3 Zq � x(H2O)
  (42.11.06)Leucophosphite Group Leucophosphite KFe2(PO4)2(OH)•2(H2O) P 21/n 2/m Tinsleyite KAl2(PO4)2(OH)•2(H2O) P 21/n 2/m Spheniscidite (NH4,K)(Fe,Al)2(PO4)2(OH)•2(H2O) P 21/n 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: 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

Search for Tinsleyite using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Tinsleyite :

Ask about Tinsleyite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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


Dana No: Strunz No: 08.DH.10





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.