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Baumite

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John Leach Baum
Formula:
(Mg,Al,Mn,Zn,Fe)3(Si,Al)2O5(OH)4
Colour:
medium brown, blackish brown, rarely slight dark reddish brown.
Lustre:
Waxy, Greasy
Hardness:
2
Name:
Named in 1975 by Clifford Frondel and Jun Ito in honor of John Leach Baum [March 15, 1916 New York, New York, USA - October 16, 2011 Hamburg, New Jersey, USA], graduate of Harvard University and student under Dr. Charles Palache. He was the former Head Geologist, Franklin Mine, Curator Emeritus of the Franklin Mineral Museum, author and contributor to the mineralogy and geology of the Franklin deposit.
A variety of Lizardite

Baumite is a medium brown to nearly black manganoan lizardite which, as with many serpentines. may be intergrown with minor amounts of chlorite. Clark [1993, "Hey's Mineral Index"] reports this as a species, but Nickel and Nichols [1991, "Mineral Reference Manual"] regarded it as 'a mixture of several serpentines and chlorites', quoting Frondel and Ito, (American Mineralogist, 1975)


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Classification of BaumiteHide

Discredited
16.7.10

16 : Silicates Containing Aluminum and other Metals
7 : Aluminosilicates of Mg

Physical Properties of BaumiteHide

Waxy, Greasy
Transparency:
Translucent, Opaque
Colour:
medium brown, blackish brown, rarely slight dark reddish brown.
Hardness:
Tenacity:
Brittle
Fracture:
Irregular/Uneven

Chemical Properties of BaumiteHide

Formula:
(Mg,Al,Mn,Zn,Fe)3(Si,Al)2O5(OH)4

Synonyms of BaumiteHide

Other Language Names for BaumiteHide

German:Baumit
Spanish:Baumita

Relationship of Baumite to other SpeciesHide

Other Members of this group:
AmesiteMg2Al(AlSiO5)(OH)4Tric. 1 : P1
AntigoriteMg3(Si2O5)(OH)4Mon. m : Bm
Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4Mon. m : Bm
Brindleyite(Ni,Al)3(Si,Al)2O5(OH)4Mon.
CaryopiliteMn2+3Si2O5(OH)4Mon.
ChrysotileMg3(Si2O5)(OH)4Mon.
CronstedtiteFe2+2Fe3+((Si,Fe3+)2O5)(OH)4Trig. 3m : P3 1m
Fraipontite(Zn,Al)3((Si,Al)2O5)(OH)4Mon.
GuidottiiteMn2Fe3+(Fe3+SiO5)(OH)4Hex. 6 : P63
KellyiteMn2+2Al(AlSiO5)(OH)4Hex.
LizarditeMg3(Si2O5)(OH)4
Népouite(Ni,Mg)3(Si2O5)(OH)4Orth.
PecoraiteNi3(Si2O5)(OH)4Mon.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Willemite1 photo of Baumite associated with Willemite on mindat.org.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

16.7.1PyropeMg3Al2(SiO4)3Iso.
16.7.2SapphirineMg4(Mg3Al9)O4[Si3Al9O36]Mon. 2/m : P21/b
16.7.3Sapphirine-1A(Mg,Al,Fe2+)8[(Al,Si,Fe3+)6O18]O2Tric. 1 : P1
16.7.4MagnesiochloritoidMgAl2(SiO4)O(OH)2Mon. 2/m : B2/b
16.7.5KulkeiteMg8Al(AlSi7O20)(OH)10Mon.
16.7.6Palygorskite(Mg,Al)5(Si,Al)8O20(OH)2 · 8H2OMon. 2/m : B2/m
16.7.7SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2OMon.
16.7.8AliettiteCa0.2Mg6((Si,Al)8O20)(OH)4 · 4H2OMon.
16.7.9Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2OMon. 2/m : B2/m

Fluorescence of BaumiteHide

Not fluorescent in UV

Other InformationHide

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

Internet Links for BaumiteHide

Localities for BaumiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Ústí Region
      • Chomutov (Komotau)
Řehoř, M., Dvořák, Z.: Nové poznatky o mineralogii lokality Ahníkov. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 1997, roč. 4-5, s. 183-185.
Norway
 
  • Sør-Trøndelag
    • Oppdal
Witsø, Tor (1994): Oppdal. Et spennende geologisk område. Oppdal. 24 pp. Published by Fridtjov Witsø, Oppdal.
USA
 
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Franklin
Frondel and Ito, 1975, American Mineralogist
Mineral and/or Locality  
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