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Pilawite-(Y)

Collectors Summary

Color weiß
Streak color weiß
Lustre Glasglanz
Hardness (Mohs) 5
Cleavages 4.007 (berechnet)
Crystal System monoklin, P21/c

Chemism

Chem­ical formula

Ca2Y2Al4(SiO4)4O2(OH)2

Chem­ical com­po­si­tion

Aluminium, Calcium, Silicium, Yttrium, Sauerstoff, Wasserstoff

Unit weight: 800.2412708 u; Number of atoms in the formula: 34

Info

Empirical formula:

Ca2Y2Al4(SiO4)4O2(OH)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.25

2

5.88

1.0079470

2.0158940

Oxygen

O

39.99

20

58.82

15.9994300

319.9886000

Aluminium

Al

13.49

4

11.76

26.9815382

107.9261528

Silicon

Si

14.04

4

11.76

28.0855300

112.3421200

Calcium

Ca

10.02

2

5.88

40.0784000

80.1568000

Yttrium

Y

22.22

2

5.88

88.9058520

177.8117040

Strunz 9th edi­tion incl. updates

9.AG.

9: Silikate (Germanate)
A: Inselsilikate (Nesosilikate)
G: Insel(Neso)silikate mit zusätzlichem Anionen; Kationen in meist [6] und > [6] Koordination

Lapis Clas­sifica­tion

VIII/B.14-030

VIII: SILIKATE
B: Inselsilikate mit tetraederfremden Anionen
14: Kationen mit Koordinationszahlen zwischen [8] und [12]

IMA sta­tus

anerkannt - CNMNC Newsletter No. 20, Juni 2014, page 551

Min­eral sta­tus

anerkanntes Mineral

Optical Properties

Color

weiß

Streak color

weiß

Diaphane­ity (Trans­parency)

durchscheinend

Lus­tre

Glasglanz

max. Birefrin­gence

0.036

Birefringence chart\! Pilawite-(Y) title=Birefringence chart Pilawite-(Y)

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

α = 1.743(5)

RI value β

β = 1.754(5)

RI value γ / ε

γ = 1.779(5)

Ri mean

1.759

2V angle

Biaxial (+) 65(2)° (gemessen), 68° (berechnet)

Pleochro­ism

keiner

Bireflectance

Δ = 0.03–0.04

Crystallography

Crystal Sys­tem

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/c

Cell param­e­ters a (Å)

8.571(5)

Cell param­e­ters b (Å)

7.261(4)

Cell param­e­ters c (Å)

11.187(6)

Cell param­e­ters a/b or c/a

1.18

Cell param­e­ters c/b

1.541

Cell param­e­ters α

90°

Cell param­e­ters β

91.00(2)

Cell param­e­ters γ

90°

Z

2

Volumne (ų)

696.106

Kristall struc­ture

Verwandt mit Palermoit

X-Ray Pow­der Diffrac­tion

3.921(38), 3.044(100), 2.791(43), 2.651(46), 2.583(54), 2.485(62), 2.408(45), 2.147(42)

XRD chart Pilawite-(Y)

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Physical Properties

Hard­ness (Mohs)

5

Density (g/cm³)

3.818 ( ρ calc. Mineralienatlas )

Cleav­ages

4.007 (berechnet)

Tenac­ity

spröde

(Co-)Type locality

(Co-)Type locality

Polen/Niederschlesien (Dolnoslaskie), Woiwodschaft/Dzierżoniow, Powiat/Piława Górna (Ober-Peilau)

Polen/Niederschlesien (Dolnoslaskie), Woiwodschaft/Dzierżoniow, Powiat/Piława Górna (Ober-Peilau)/Steinbruch/Julianna Pegmatit

Type mate­r­ial

Mineralogical Museum of the University of Wroclaw, Wroclaw, Poland

Col­lec­tion number of type mate­r­ial

MMWr IV7676

Preface

Author (Name, Year)

Pieczka, A., Hawthorne, F.C., Cooper, M.A., Szełeg, E., Szuszkiewicz, A., Turniak, K., Nejbert, K., Ilnicki, S.S. (2014)

References

Pieczka, A., Hawthorne, F.C.,Cooper, M.A., Szełeg, E., Szuszkiewicz, A.,Turniak, K., Nejbert, K., Ilnicki, S.S. (2014) Pilawite, IMA 2013-125. CNMNC Newsletter No. 20, June 2014, page 551; Mineralogical Magazine, 78, 549-558

Pieczka, A., Hawthorne, F.C., Cooper, M.A., Szełęg, E., Szuszkiewicz, A., Turniak, K., Nejbert, K., Ilnicki, S. - Pilawite-(Y), Ca2(Y,Yb)2[Al4(SiO4)4O2(OH)2], a new mineral from the Piława Górna granitic pegmatite, southwestern Poland: mineralogical data, crystal structure and association. Mineralogical Magazine, 79 (2015), 1143-1157.

Other languages

German

Pilawit-(Y)

English

Pilawite-(Y)

CNMNC (IMA)-Number

IMA 2013-125

CNMNC symbol

Symbol

Plw-Y

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Pilawit-(Y)
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Mineralienatlas.de (Forum) - search for: Pilawit-(Y)

English pages

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RRUFF - Raman, XRD and other mineral data - search for: Pilawite-(Y)
RRUFF - References and PDF downloads - search for: Pilawite-(Y)
American-Mineralogist-Crystal-Structure-Database - search for: Pilawite-(Y)
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Mineral Dealer

German pages

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Locations with GPS information