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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 ...
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)


Classification of Baumite

Discredited
16.7.10

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

Physical Properties of Baumite

Waxy, Greasy
Diaphaneity (Transparency):
Translucent, Opaque
Colour:
medium brown, blackish brown, rarely slight dark reddish brown.
Hardness (Mohs):
2
Tenacity:
Brittle
Fracture:
Irregular/Uneven

Chemical Properties of Baumite

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

Relationship of Baumite to other Species

Other Members of Group:
AmesiteMg2Al(AlSiO5)(OH)4
AntigoriteMg3(Si2O5)(OH)4
Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4
Brindleyite(Ni,Al)3(Si,Al)2O5(OH)4
CaryopiliteMn32+Si2O5(OH)4
ChrysotileMg3(Si2O5)(OH)4
CronstedtiteFe22+Fe3+((Si,Fe3+)2O5)(OH)4
Fraipontite(Zn,Al)3((Si,Al)2O5)(OH)4
KellyiteMn22+Al(AlSiO5)(OH)4
LizarditeMg3(Si2O5)(OH)4
Népouite(Ni,Mg)3(Si2O5)(OH)4
PecoraiteNi3(Si2O5)(OH)4
16.7.1PyropeMg3Al2(SiO4)3
16.7.2SapphirineMg4(Mg3Al9)O4[Si3Al9O36]
16.7.3Sapphirine-1A(Mg,Al,Fe2+)8[(Al,Si,Fe3+)6O18]O2
16.7.4MagnesiochloritoidMgAl2(SiO4)O(OH)2
16.7.5KulkeiteMg8Al(AlSi7O20)(OH)10
16.7.6Palygorskite(Mg,Al)5(Si,Al)8O20(OH)2 · 8H2O
16.7.7SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
16.7.8AliettiteCa0.2Mg6((Si,Al)8O20)(OH)4 · 4H2O
16.7.9Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O

Other Names for Baumite

Name in Other Languages:
German:Baumit
Spanish:Baumita

Other Information

Not fluorescent in UV
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 Baumite

mindat.org URL:
https://www.mindat.org/min-573.html
Please feel free to link to this page.

Localities for Baumite

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.
(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.
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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