Pinnoite Mineral Data

General Pinnoite Information

Chemical Formula:

MgB2O4•3(H2O)

Composition:

Molecular Weight = 163.97 gm

Magnesium 14.82 % Mg 24.58 % MgO

Boron 13.19 % B 42.46 % B₂O₃

Hydrogen 3.69 % H 32.96 % H₂O

Oxygen 68.30 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

MgB₂O₄•3(H₂O)

Environment:

Evaporite salt deposits.

IMA Status:

Valid Species (Pre-IMA) 1884

Locality:

Stassfurt and Aschersleben, Saxony, Germany. Eagle Borax works, Death Valley, California, USA. Link to MinDat.org Location Data.

Name Origin:

Named for chief councilor of Mines, Pinno, of Halle, Germany.

Name Pronunciation:

Pinnoite

Synonym:

ICSD 20662

PDF 25-119

Pinnoite Image

Images:

Pinnoite Inderite

Comments: Pale green translucent crystalline pinnoite on chalky white inderite.
Location: Lake Inder, Atyrau, Kazakhstan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Pinnoite Crystallography

Axial Ratios:

a:c = 1:1.07522

Cell Dimensions:

a = 7.617, c = 8.19, Z = 4; V = 475.17 Den(Calc)= 2.29

Crystal System:

Tetragonal - Pyramidal H-M Symbol (4) Space Group: P 4₂

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

By Intensity(I/I_o): 5.39(1), 2.31(0.7), 2.05(0.5),3.16(0.4), 1.91(0.3), 2.25(0.3), 1.57(0.2),

Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

Forms: ( 1 1 2) ( 1 1 0) ( 0 1 1)

Warning: this java applet does not work in some browsers because of security restrictions.

Physical Properties of Pinnoite

Cleavage:

{???} Indistinct

Color:

Colorless, Yellow, Yellow green, Light yellow.

Density:

2.29

Diaphaneity:

Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

3.5 - Copper Penny

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Pinnoite

Gladstone-Dale:

CI meas= 0.014 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.014 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2489,KPDmeas= 0.2489,KC= 0.2525
Ncalc = 1.58

Optical Data:

Uniaxial (+), w=1.565, e=1.575, bire=0.0100.

Calculated Properties of Pinnoite

Electron Density:

Bulk Density (Electron Density)=2.35 gm/cc
note: Specific Gravity of Pinnoite =2.29 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Pinnoite= 0.58 barns/electron
U=PE_Pinnoite x rElectron Density= 1.36 barns/cc.

Radioactivity:

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

Pinnoite Classification

Dana Class:

25.02.03.01 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.02)Dana Type

(25.02.03)Dana Group

25.02.03.01 Pinnoite MgB2O4•3(H2O) P 4₂ 4

Strunz Class:

06.BB.05 06 - BORATES

06.B - Diborates

06.BB -Neso-diborates with double tetrahedra B2O(OH)6; 2(2T)

06.BB.05 Pinnoite MgB2O4•3(H2O) P 4₂ 4

Other Pinnoite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Pinnoite :
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 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

Search for Pinnoite using:

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

Visit our Advertisers for Pinnoite :

Ask about Pinnoite 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 Pinnoite Specimen Label here :

Pinnoite

MgB2O4•3(H2O)
Dana No: 25.02.03.01 Strunz No: 06.BB.05
Locality:

Notes:

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