Pinnoite Mineral Data

Pinnoite Mineral Data +

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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.

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 - PyramidalH-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:

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Forms: [ 1 1 2] [ 1 1 0] [ 0 1 1]

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Physical Properties of Pinnoite

Cleavage:

[???] Indistinct

Color:

Colorless, Yellow, Yellow green, Light yellow.

Density:

2.29

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Pinnoite

Electron Density:

r_electron=2.35 gm/cc
note: r_Pinnoite=2.29 gm/cc.

Fermion Index

Fermion Index = 0.04139
Boson Index = 0.95861

Photoelectric:

PE_Pinnoite= 0.58 barns/electron
U=PE_Pinnoite x r_electron= 1.36 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pinnoite is Not Radioactive

Pinnoite Classification

Dana Class:

25.2.3.1 (25)Anhydrous Borates Containing Hydroxyl or Halogen

(25.2)Dana Type

(25.2.3)Dana Group

25.2.3.1 Pinnoite MgB2O4·3(H2O) P 4₂ 4

Strunz Class:

V/H.04-10 V - Nitrates, Carbonates and Borates

V/H - Group borates. Planary groups [B2O5]4- to [B2O7]2-

V/H.04 - Pinnoite - Pentahydroborite series

V/H.04-10 Pinnoite MgB2O4·3(H2O) P 4₂ 4

V/H.04-20 Satimolite KNa2Al4(B2O5)3Cl3·13(H2O) Unk Ortho

V/H.04-30 Pentahydroborite CaB2O(OH)6·2(H2O) P1 1

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

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

Pinnoite

MgB2O4·3(H2O)
Dana No: 25.2.3.1 Strunz No: V/H.04-10
Locality:

Notes: