Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Macfallite

This page is currently not sponsored. Click here to sponsor this page.
Formula:
Ca2(Mn3+,Al)3(Si2O7)(SiO4)(OH)3
System:
Monoclinic
Colour:
Reddish-brown, maroon.
Lustre:
Silky
Hardness:
5
Name:
For US author and amateur mineralogist Russell Patterson MacFall (1903-1983).
This page provides mineralogical data about Macfallite.

Classification of Macfallite

Approved 1974
9.BG.15

9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
58.2.3.2

58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
2 : Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
16.16.20

16 : Silicates Containing Aluminum and other Metals
16 : Aluminosilicates of Mn
mindat.org URL:
http://www.mindat.org/min-2508.html
Please feel free to link to this page.

First Recorded Occurrence of Macfallite

Year of Discovery:
1974

Physical Properties of Macfallite

Silky
Colour:
Reddish-brown, maroon.
Hardness (Mohs):
5

Crystallography of Macfallite

Crystal System:
Monoclinic
Cell Parameters:
a = 10.23Å, b = 6.08Å, c = 8.97Å
β = 110.75°
Ratio:
a:b:c = 1.683 : 1 : 1.475
Unit Cell Volume:
V 521.73 ų (Calculated from Unit Cell)

Optical Data of Macfallite

Type:
Biaxial (-)
RI values:
nα = 1.773 - 1.775 nβ = 1.795 nγ = 1.810 - 1.815
2V:
Measured: 86° , Calculated: 78° to 88°
Max Birefringence:
δ = 0.037 - 0.040
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r < v medium

Chemical Properties of Macfallite

Formula:
Ca2(Mn3+,Al)3(Si2O7)(SiO4)(OH)3
Essential elements:
All elements listed in formula:
Common Impurities:
Ti,Al,Fe,Cr,V,Cu,Mg,K,Na,H2O

Relationship of Macfallite to other Species

9.BG.05bAllanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05bAllanite-(La){CaLa}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05bAllanite-(Y){CaY}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05aClinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
9.BG.05bDissakisite-(Ce){CaCe}{Al2Mg}(Si2O7)(SiO4)O(OH)
9.BG.05Dollaseite-(Ce){CaCe}{MgAlMg}(Si2O7)(SiO4)(OH)F
9.BG.05aEpidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
9.BG.05Epidote-(Pb){CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
9.BG.05Khristovite-(Ce){CaCe}{MgAlMn2+}(Si2O7)(SiO4)(OH)F
9.BG.05Mukhinite{Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH)
9.BG.05Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
9.BG.05Piemontite-(Sr){CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
9.BG.05bManganiandrosite-(La){Mn2+La}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)
9.BG.05Tawmawite{Ca2}{(Al,Fe3+,Cr)3}(Si2O7)(SiO4)O(OH)
9.BG.05Manganipiemontite-(Sr){CaSr}{Mn3+AlMn3+}(Si2O7)(SiO4)O(OH)
9.BG.05bFerriallanite-(Ce){CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
9.BG.05Clinozoisite-(Sr){CaSr}{Al3}(Si2O7)(SiO4)O(OH)
9.BG.05Manganiandrosite-(Ce){(Mn2+,Ca)(Ce,REE)}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)
9.BG.05Dissakisite-(La){CaLa}{Al2Mg}(Si2O7)(SiO4)O(OH)
9.BG.05Vanadoandrosite-(Ce){Mn2+Ce}{V3+AlMn2+}(Si2O7)(SiO4)O(OH)
9.BG.05Uedaite-(Ce){Mn2+Ce}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05Epidote-(Sr){CaSr}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
9.BG.05bAllanite-(Nd){CaNd}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05bFerriallanite-(La){CaLa}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
9.BG.05bÅskagenite-(Nd){Mn2+Nd}{Al2Fe3+}(Si2O7)(SiO4)O2
9.BG.10Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
9.BG.15SursassiteMn22+Al3(Si2O7)(SiO4)(OH)3
9.BG.20Julgoldite-(Fe2+)Ca2(Fe2+,Mg)(Fe3+,Al)2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20OkhotskiteCa2(Mn2+,Mg)(Mn3+,Al,Fe3+)2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20Pumpellyite-(Fe2+)Ca2Fe2+Al2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20Pumpellyite-(Fe3+)Ca2(Fe3+,Mg,Fe2+)(Al,Fe3+)2(Si2O7)(SiO4)(OH,O)2 · H2O
9.BG.20Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20Pumpellyite-(Mn2+)Ca2(Mn2+,Mg)(Al,Mn3+,Fe3+)2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20ShuiskiteCa2(Mg,Al)(Cr,Al)2(Si2O7)(SiO4)(OH)2 · 2H2O
9.BG.20Julgoldite-(Fe3+)Ca2(Fe3+,Mg)(Fe3+,Al)2(Si2O7)(SiO4)(OH,O)2 · H2O
9.BG.20Pumpellyite-(Al)Ca2(Al,Fe2+,Mg)Al2(Si2O7)(SiO4)(OH,O)2 · H2O
9.BG.20PoppiiteCa2(V3+,Fe3+,Mg)(V3+,Al)2(Si2O7)(SiO4)(OH,O)2 · H2O
9.BG.20Julgoldite-(Mg)Ca2(Mg,Fe2+)(Fe3+,Al)2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.25GanomalitePb9Ca5Mn(Si2O7)4(SiO4)O
9.BG.30RustumiteCa10(Si2O7)2(SiO4)(OH)2Cl2
9.BG.35Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
9.BG.35WiluiteCa19(Al,Mg)13(B,☐,Al)5(Si2O7)4(SiO4)10(O,OH)10
9.BG.35ManganvesuvianiteCa19Mn3+(Al,Mn3+,Fe3+)10(Mg,Mn2+)2(Si2O7)4(SiO4)10O(OH)9
9.BG.35FluorvesuvianiteCa19(Al,Mg,Fe2+)13(Si2O7)4(SiO4)10O(F,OH)9
9.BG.40Vyuntspakhkite-(Y)(Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7
9.BG.45DellaiteCa6(Si2O7)(SiO4)(OH)2
9.BG.50Gatelite-(Ce)CaCe3Al2(Al,Mg)(Mg,Fe2+,Al)(Si2O7)(SiO4)3(O,F)(OH,O)2
9.BG.55Västmanlandite-(Ce)Ca(Ce,La)3Al2Mg2(Si2O7)(SiO4)3(OH)2F
16.16.1KanonaiteMn3+Al(SiO4)O
16.16.2SpessartineMn32+Al2(SiO4)3
16.16.3DavreuxiteMnAl6Si4O17(OH)2
16.16.4SursassiteMn22+Al3(Si2O7)(SiO4)(OH)3
16.16.5CarpholiteMn2+Al2(Si2O6)(OH)4
16.16.6KellyiteMn22+Al(AlSiO5)(OH)4
16.16.7PennantiteMn52+Al(AlSi3O10)(OH)8
16.16.8Akatoreite(Mn2+,Fe2+)9Al2(HSi4O13)2(OH)6
16.16.9Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
16.16.10Mangano-ferri-eckermannite[Na][Na2][Mn42+(Fe3+)]Si8O22(OH)2
16.16.11Masutomilite(K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2
16.16.13HowieiteNa(Fe,Mn)10(Fe,Al)2Si12O31(OH)13
16.16.14Eggletonite(Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7 · 11H2O
16.16.15BannisteriteCa0.5(K,Na)0.5(Mn,Fe,Zn)10(Si,Al)16O38(OH)8 · 5.5H2O
16.16.16Taneyamalite(Na,Ca)(Mn,Mg,Fe)12Si12(O,OH)44
16.16.17ZussmaniteK(Fe,Mg,Mn)13(Si,Al)18O42(OH)14
16.16.18CoombsiteK(Mn,Fe,Mg)13(Si,Al)18O42(OH)14
16.16.19HenritermieriteCa3(Mn3+,Al)2(SiO4)2(OH)4
16.16.21Ottrélite(Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2
16.16.22Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
16.16.23OkhotskiteCa2(Mn2+,Mg)(Mn3+,Al,Fe3+)2(Si2O7)(SiO4)(OH)2 · H2O
16.16.24Pumpellyite-(Mn2+)Ca2(Mn2+,Mg)(Al,Mn3+,Fe3+)2(Si2O7)(SiO4)(OH)2 · H2O
16.16.25Piemontite-(Sr){CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)

Other Names for Macfallite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Macfallite

Reference List:
Moore, P.B., Ito, J., and Steele, I.M. (1979) Macfallite and orientite: calcium manganese (III) silicates from upper Michigan. Mineralogical Magazine: 43: 325-331.

American Mineralogist (1980): 65: 406.

Moore, P.B., J. Shen, and T. Araki (1985) Crystal chemistry of the 2∞[M 3+ 2ф2(TO4)2] sheet: structural principles and crystal structures of ruizite, macfallite and orientite. American Mineralogist (1985): 70: 171-181.

Neues Jahrbuch für Mineralogie, Monatshefte (1989): 455.

Nagashima, Mariko; Rahmoun, Nouri-Said; Alekseev, Evgeny V.; Geiger, Charles A.; Armbruster, Thomas; Akasaka, Masahide (2008): Crystal chemistry of macfallite: relationships to sursassite and pumpellyite. American Mineralogist 93, 1851-1857.

Internet Links for Macfallite

Localities for Macfallite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Italy
 
  • Aosta Valley
    • Saint-Marcel
- Ciriotti, M.E., Camara, F., Bittarello, E., Ambrino, P. (2013). Macfallite: secondo ritrovamento italiano a Prabornaz. Micro, 11, 50-59
  • Liguria
    • La Spezia Province
      • Vara Valley
        • Borghetto Vara
Palenzona A. (1990) - Orientite e MacFallite di Cerchiara (La Spezia) - Rivista Mineralogica Italiana, Milano, Fasc. 2, pp111-114
Japan
 
  • Hokkaido
    • Okhotsk Subprefecture (Abashiri Province)
      • Tokoro-gun
Miyajima, N., Osawa, S., Miura, H., Kikuchi, T. and Hiriya, Yu (1994) Proceedings of the 9th Quadrennial International Association on the Genesis of Ore Deposits (IAGOD) Symposium (Beijing), 603-616.
USA
 
  • Michigan
    • Keweenaw Co.
      • Copper Harbor
yalmer primeau
[Nickel & Nichols, 1991 - "Mineral Reference Manual", p124]
Mineral and/or Locality  
Copyright © mindat.org 1993-2015, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: January 30, 2015 06:30:49 Page generated: January 29, 2015 18:28:41