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Perhamite

Pictures (2 Images total)

Perhamit, BB 1,0 mm
Views (Image: 1241452607): 1177
Perhamit, BB 1,0 mm (SNr: B004169)

schuppi, perlmuttglänzend; Silver Coin Mine, Valmy, Humboldt Co., Nevada

Collection: Lithothek der Münchener Micromounter
Copyright: Hannes Osterhammer
Contribution: eschuhbauer 2009-05-04
Locality: Silver Coin Mine / Valmy / Iron Point District / Humboldt Co. / Nevada / USA
Perhamit
Views (Image: 1413980870): 671
Perhamit

Bildbreite: 4 mm; Fundort: Emmons Quarry (Uncle Tom Mountain Quarry), Uncle Tom Mountain, Greenwood, Oxford Co., Maine, USA

Copyright: Stephan Wolfsried
Contribution: Hg 2014-10-22
Locality: Emmons Quarry (Uncle Tom Mountain Quarry) / Uncle Tom Mountain / Greenwood / Oxford Co. / Maine / USA

Collectors Summary

Color braun
Streak color weiß
Lustre stumpf auf Spaltflächen Glasglanz
Hardness (Mohs) 5
Crystal System trigonal, P3m1
Morphology Einzelne, sphärolitische Massen bis 1 mm Durchmesser, aufgebaut aus tafeligen Kristallen.

Chemism

Chem­ical formula

(Ca,Sr)3Al8[(OH)14|(PO4)4|Si3O8]·8 H2O

Addi­tional chem. informa­tion

Beimengungen von Ti,Fe,Mg,Na,F

Chem­ical com­po­si­tion

Aluminium, Calcium, Silicium, Strontium, Phosphor, Sauerstoff, Wasserstoff

Unit weight: 1346.1082804 u; Number of atoms in the formula: 94

Info

Empirical formula:

(Ca0.75Sr0.25)3Al8[(OH)14(PO4)4Si3O8]·8H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

2.25

30

31.91

1.0079470

30.2384100

Oxygen

O

54.67

46

48.94

15.9994300

735.9737800

Aluminium

Al

16.04

8

8.51

26.9815382

215.8523056

Silicon

Si

6.26

3

3.19

28.0855300

84.2565900

Phosphorus

P

9.20

4

4.26

30.9737612

123.8950448

Calcium

Ca

6.70

2.25

2.39

40.0784000

90.1764000

Strontium

Sr

4.88

0.75

0.80

87.6210000

65.7157500

Strunz 9th edi­tion incl. updates

8.DO.20

8: Phosphate, Arsenate, Vanadate
D: Phosphate, mit weiteren Anionen, mit H2O
O: Mit CO3, SO4, SiO4
20:Perhamit-Gruppe

Lapis Clas­sifica­tion

VIII/J.20-010

VIII: SILIKATE
J: Gerüstsilikate (mit Zeolithen)
20: Gerüstsilikate mit Zeolithstruktur

Clas­sifica­tion by Hölzel

8.DP.300

8: PHOSPHATES ARSENATES VANADATES
D: Phosphates (+Anions +Water)
P: With other Structures

Hey's Chem­ical Index of Min­er­als

17.06.02

17: Silicates Containing other Anions
06: Silicates with phosphate

Dana 8th edi­tion

43.05.10.01

43: Compound Phosphates, etc.
05: Compound Phosphates, etc. (Hydrated Compound Anions With Hydroxyl or Halogen)

IMA sta­tus

anerkannt 1977

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

Perhamite group

Optical Properties

Color

braun

Streak color

weiß

Diaphane­ity (Trans­parency)

durchscheinend bis opak

Lus­tre

stumpf auf Spaltflächen Glasglanz

max. Birefrin­gence

0.013

Birefringence chart\! Perhamite title=Birefringence chart Perhamite

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

1.564

RI value γ / ε

1.577

Ri mean

1.568

2V angle

Uniaxial (+)

Crystallography

Crystal Sys­tem

trigonal

Class (H-M)

3m

Space Group number

164

Space Group

P3m1

Cell param­e­ters a (Å)

7.022

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

20.182

Cell param­e­ters a/b or c/a

2.874

Cell param­e­ters c/b

-

Z

1

Volumne (ų)

861.82

X-Ray Pow­der Diffrac­tion

2.882 (100), 5.80 (71), 6.08 (50), 3.510 (50), 3.115 (50), 1.757 (50), 6.71 (35)

Morphol­ogy

Einzelne, sphärolitische Massen bis 1 mm Durchmesser, aufgebaut aus tafeligen Kristallen.

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

5

VHN (Hard­ness Vick­ers)

390 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.64

2.594 ( ρ calc. Mineralienatlas )

Radioac­tiv­ity

Perhamit ist nicht radioaktiv.

(Co-)Type locality

(Co-)Type locality

USA/Maine/Oxford Co./Newry/Bell Pit

Type mate­r­ial

Das Typmaterial befindet sich im naturhistorischen Museum in London und im naturhistorischen Museum in Washington DC.

Preface

Occurrences

In Pegmatiten mit zerklüfteten Amblygonit-reichen Zonen.

Asso­cia­tions

Siderit, Wardit, Amblygonit, Eosphorit, Sphalerit, Minyulit, Wavellit

Rare­ness

selten

Name from

Benannt nach dem amerikanischen Geologen Frank C. Perham.

Author (Name, Year)

Dunn & Appleman, 1977

Rel­evance, Usage

Perhamit hat keinerlei wirtschaftliche Bedeutung. Sammlermineral

References

MILLS, S. et al., 2006, Min. Mag. 70S. 201-209

IMA group assignments


 
 
Ca3Al7.7Si3P4O22.9(OH)13.3F2·8H2O
trigonal
P3m1

 
 
(Ca,Sr)3Al8[(OH)14|(PO4)4|Si3O8]·8 H2O
trigonal
P3m1

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Actuality: 22. Jun 2022 - 14:21:51

Other languages

German

Perhamit

Spanish

Perhamita

English

Perhamite

French

Perhamite

CNMNC (IMA)-Number

IMA 1975-019

CNMNC symbol

Symbol

Phm

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

German pages

DeWikiPedia - search for: Perhamit
Google-Bilder-Suche - search for: Perhamit
Mineralienatlas.de (Forum) - search for: Perhamit

English pages

Mindat - search for: Perhamite
Webmineral - search for:Perhamite
Handbook-of-Mineralogy - search for: Perhamite
RRUFF - Raman, XRD and other mineral data - search for: Perhamite
RRUFF - References and PDF downloads - search for: Perhamite
American-Mineralogist-Crystal-Structure-Database - search for: Perhamite
Strahlen.org - search for: Perhamite

Mineral Dealer

German pages

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Crystal-Treasure.com - search for: Perhamit
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Locations with GPS information