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Macfallite (Macfallit)

Pictures (8 Images total)

Macfallit
Views (File:
1475009972
): 581
Macfallit
Finely fibrous sprays of macfallite emanate from framboidal masses of braunite. One of the last specimens to be collected from the underground workings before the drift was sealed. Travis Olds 2012; Field of view: 4.4 mm; Manganese Mine, Copper Harbor, Keweenaw Co., Michigan, USA
Copyright: Travis Olds; Contribution: Stefan
Location: USA/Michigan/Keweenaw Peninsula/Keweenaw Co./Copper Harbor/Manganese Mine
Mineral: Macfallite
Image: 1475009972
Rating: 9 (votes: 1)
License: Usage for Mineralienatlas project only
Macfallit

Finely fibrous sprays of macfallite emanate from framboidal masses of braunite. One of the last specimens to be collected from the underground workings before the drift was sealed. Travis Olds 2012...
Copyright: Travis Olds
Contribution: Stefan 2016-09-27
Locality: Manganese Mine / Copper Harbor / Keweenaw Co. / Keweenaw Peninsula / Michigan / USA
Macfallit
Views (File:
1256401468
): 873
Macfallit
Größe: 4 x 2,3 x 2,1 cm, Fundort: Manganese Mine, Keweenaw Co., Michigan, USA.
Copyright: Rob Lavinsky; Contribution: thdun5
Location: USA/Michigan/Keweenaw Peninsula/Keweenaw Co./Copper Harbor/Manganese Mine
Mineral: Macfallite
Image: 1256401468
Rating: 6.5 (votes: 2)
License: Usage for Mineralienatlas project only
Macfallit

Größe: 4 x 2,3 x 2,1 cm, Fundort: Manganese Mine, Keweenaw Co., Michigan, USA.
Copyright: Rob Lavinsky
Contribution: thdun5 2009-10-24
Locality: Manganese Mine / Copper Harbor / Keweenaw Co. / Keweenaw Peninsula / Michigan / USA
Macfallit
Views (File:
1428843201
): 427
Macfallit
Nadelige strahlige rotbraune Kristalle, BB = 1,8 mm; Fundort: Manganese Mine, Copper Harbor, Keweenaw Co., Michigan, USA.
Copyright: Manfred Früchtl; Contribution: Münchener Micromounter
Collection: Lithothek der Münchener Micromounter, Collection number: A033326, Donator: anatase2
Location: USA/Michigan/Keweenaw Peninsula/Keweenaw Co./Copper Harbor/Manganese Mine
Mineral: Macfallite
Image: 1428843201
Rating: 7 (votes: 1)
License: Usage for Mineralienatlas project only
Macfallit (SNr: A033326)

Nadelige strahlige rotbraune Kristalle, BB = 1,8 mm; Fundort: Manganese Mine, Copper Harbor, Keweenaw Co., Michigan, USA.
Collection: Lithothek der Münchener Micromounter
Copyright: Manfred Früchtl
Contribution: Münchener Micromounter 2015-04-12
Locality: Manganese Mine / Copper Harbor / Keweenaw Co. / Keweenaw Peninsula / Michigan / USA
Macfallit
Views (File:
1281242456
): 718
Macfallit
Bildbreite: 3,5 mm; Fundort: Manganese Mine, Copper Harbor, Keweenaw Co., Michigan, USA
Copyright: Joachim Esche; Contribution: slugslayer
Location: USA/Michigan/Keweenaw Peninsula/Keweenaw Co./Copper Harbor/Manganese Mine
Mineral: Macfallite
Image: 1281242456
Rating: 6 (votes: 1)
License: Usage for Mineralienatlas project only
Macfallit

Bildbreite: 3,5 mm; Fundort: Manganese Mine, Copper Harbor, Keweenaw Co., Michigan, USA
Copyright: Joachim Esche
Contribution: slugslayer 2010-08-08
Locality: Manganese Mine / Copper Harbor / Keweenaw Co. / Keweenaw Peninsula / Michigan / USA
Macfallit
Views (File:
1281242489
): 681
Macfallit
Bildbreite: 4 mm; Fundort: Manganese Mine, Copper Harbor, Keweenaw Co., Michigan, USA
Copyright: Joachim Esche; Contribution: slugslayer
Location: USA/Michigan/Keweenaw Peninsula/Keweenaw Co./Copper Harbor/Manganese Mine
Mineral: Macfallite
Image: 1281242489
Rating: 6 (votes: 1)
License: Usage for Mineralienatlas project only
Macfallit

Bildbreite: 4 mm; Fundort: Manganese Mine, Copper Harbor, Keweenaw Co., Michigan, USA
Copyright: Joachim Esche
Contribution: slugslayer 2010-08-08
Locality: Manganese Mine / Copper Harbor / Keweenaw Co. / Keweenaw Peninsula / Michigan / USA
Macfallit
Views (File:
1281242526
): 487
Macfallit
Bildbreite: 4 mm; Fundort: Manganese Mine, Copper Harbor, Keweenaw Co., Michigan, USA
Copyright: Joachim Esche; Contribution: slugslayer
Location: USA/Michigan/Keweenaw Peninsula/Keweenaw Co./Copper Harbor/Manganese Mine
Mineral: Macfallite
Image: 1281242526
Rating: 6 (votes: 1)
License: Usage for Mineralienatlas project only
Macfallit

Bildbreite: 4 mm; Fundort: Manganese Mine, Copper Harbor, Keweenaw Co., Michigan, USA
Copyright: Joachim Esche
Contribution: slugslayer 2010-08-08
Locality: Manganese Mine / Copper Harbor / Keweenaw Co. / Keweenaw Peninsula / Michigan / USA

You find additional Macfallit specimen at the Geolitho Museum

Collectors Summary

Color rötlichbraun
Streak color braun (rötlich)
Hardness (Mohs) 5
Solubility ++ HCl
Crystal System monoklin, P21/m

Chemism

Chemical formula

Ca2Mn33+(SiO4)(Si2O7)(OH)3

Chemical composition

Calcium, Mangan, Silicium, Sauerstoff, Wasserstoff

Unit weight: 556.2434007 u; Number of atoms in the formula: 25

Info

Empirical formula:

Ca2Mn3(SiO4)(Si2O7)(OH)3

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.54

3

12.00

1.0079470

3.0238410
Oxygen

O

40.27

14

56.00

15.9994300

223.9920200
Silicon

Si

15.15

3

12.00

28.0855300

84.2565900
Calcium

Ca

14.41

2

8.00

40.0784000

80.1568000
Manganese

Mn

29.63

3

12.00

54.9380499

164.8141497

Analysis wt%

CaO : 19.75, MnO : 0.69, CuO : 1.13, Al2O3 : 3.95, Mn2O3 : 35.96, SiO2 : 32.04, H2O : 5.39 (Ref: Mineralogical Magazine 79)

Strunz 9th edition incl. updates

9.BG.15

9: Silikate (Germanate)
B: Gruppensilikate (Sorosilikate)
G: Gruppen(Soro)-Silikate mit gemischten SiO4 und Si2O7 Gruppen; Kationen in oktahedraler [6] und größerer Koordination
15:Sursassit-Gruppe

Lapis Classification

VIII/C.24-010

VIII: SILIKATE
C: Gruppensilikate
24: Mischstrukturen mit [SiO4] 4--Inseln und [Si2O7] 6--Gruppen; Pumpellyit-Gruppe

Classification by Hölzel

9.BN.710

9: SILICATES
B: Sorosilicates
N: With SiO4 + Si2O7
7: Sursassite-Group

Dana 8th edition

58.02.03.02

58: Sorosilicates Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups
02: Sorosilicates Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n=1,2)
03: Sursassite and related species

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

rötlichbraun

Streak color

braun (rötlich)

max. Birefringence

0.042
Birefringence chart\! Macfallite title=Birefringence chart Macfallite

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

1.773

RI value β

1.795

RI value γ / ε

1.815

Ri mean

1.794

2V angle

Biaxial (-) 75°!

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

11

Space Group

P21/m

Cell parameters a (Å)

8.929

Cell parameters b (Å)

6.045

Cell parameters c (Å)

10.905

Cell parameters a/b or c/a

1.477

Cell parameters c/b

1.804

Cell parameters α

90°

Cell parameters β

119.10

Cell parameters γ

90°

Z

2

Volumne (ų)

514.308

X-Ray Powder Diffraction

4.763(90),
4.457(50),
3.904(80),
3.400(70),
2.971(70),
2.699(100),
2.181(70),
1.588(80)
XRD chart Macfallite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

5

VHN (Hardness Vickers)

390 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.43

3.592 ( ρ calc. Mineralienatlas )

Instability

++ HCl

(Co-)Type locality

(Co-)Type locality

USA/Michigan/Keweenaw Peninsula/Keweenaw Co./Copper Harbor/Manganese Mine

Preface

Associations

Orientit u.a.

Name from

dem Mineraliensammler und Keeweenaw-Kenner Russell P. MacFall

Author (Name, Year)

Moore & Ito & Steele, 1979

References

Mineralogical Magazine 43 (1979), 325

Other languages

German

Macfallit

Spanish

Macfallita

French

Macfallite

English

Macfallite

Russian

Макфаллит

CNMNC (IMA)-Number

IMA 1974-057

CNMNC symbol

Symbol

Mcf

Locations with GPS information