Barwoodite (original) (raw)

A valid IMA mineral species

About BarwooditeHide

This section is currently hidden. Click the show button to view.

Formula:

Mn2+6Nb5+(SiO4)2O3(OH)3

Specific Gravity:

4.1 - 4.4

Name:

Named in honor of Henry “Bumpi” L. Barwood (1947, Alameda, California, USA - 2016, Alabama, USA), professor of geology at Troy University, Troy, Alabama, USA. Dr. Barwood was also very active in the mineral collecting community and on MinDat.

This page provides mineralogical data about Barwoodite.

Unique IdentifiersHide

This section is currently hidden. Click the show button to view.

Long-form identifier:

mindat:1:1:52148:4

c5c60e0d-686c-4451-affa-cbbff497cfb0

IMA Classification of BarwooditeHide

This section is currently hidden. Click the show button to view.

IMA Formula:

Mn2+6(Nb5+,◻)2(SiO4)2(O,OH)6

Type description reference:

Kampf, Anthony R., Celestian, Aaron J., Nash, Barbara P. (2018) Barwoodite, Mn2+6(Nb5+,□)2(SiO4)2(O,OH)6, a New Member of the Welinite Group from Granite Mountain, Arkansas. The Canadian Mineralogist, 56 (5) 799-809 doi:10.3749/canmin.1800032

Classification of BarwooditeHide

This section is currently hidden. Click the show button to view.

9.AF.

9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination

Mineral SymbolsHide

This section is currently hidden. Click the show button to view.

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of BarwooditeHide

This section is currently hidden. Click the show button to view.

Density:

4.1 - 4.4 g/cm3 (Measured) 4.227 g/cm3 (Calculated)

Optical Data of BarwooditeHide

This section is currently hidden. Click the show button to view.

RI values:

_n_ω = 1.873(3) _n_ε = 1.855(5)

δ = 0.018

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Chemistry of BarwooditeHide

This section is currently hidden. Click the show button to view.

Mindat Formula:

Mn2+6Nb5+(SiO4)2O3(OH)3

Crystallography of BarwooditeHide

This section is currently hidden. Click the show button to view.

Class (H-M):

3 - Pyramidal

Cell Parameters:

a = 8.2139(10) Å, c = 4.8117(4) Å

Morphology:

Hexagonal plates

X-Ray Powder DiffractionHide

This section is currently hidden. Click the show button to view.

Powder Diffraction Data:

Geological EnvironmentHide

This section is currently hidden. Click the show button to view.

Type Occurrence of BarwooditeHide

This section is currently hidden. Click the show button to view.

General Appearance of Type Material:

Brownish-red plates to about 3 mm in diameter and 0.5 mm thick.

Place of Conservation of Type Material:

Cotype material is deposited in the mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue numbers 66634, 66635, 66636 and 66637.

Empirical Formula of Type Material:

Mn+62(Nb5+0.94Fe3+0.18Mn3+0.11◻ 0.77)Σ2(SiO4)2[O3.58(OH)2.42]Σ6

Associated Minerals at Type Locality:

Reference:

Kampf, A.R., Celestian, A.J., Nash, B.P. (2018): Barwoodite, Mn6+(Nb5+,⃞)2(SiO4)2(O,OH)6, a New Member of the Welinite Group from Granite Mountain, Arkansas. The Canadian Mineralogist, 56, 799-809.

Synonyms of BarwooditeHide

This section is currently hidden. Click the show button to view.

Other Language Names for BarwooditeHide

This section is currently hidden. Click the show button to view.

Relationship of Barwoodite to other SpeciesHide

This section is currently hidden. Click the show button to view.

Other Members of this group:

Common AssociatesHide

This section is currently hidden. Click the show button to view.

Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

This section is currently hidden. Click the show button to view.

Other InformationHide

This section is currently hidden. Click the show button to view.

Notes:

Loses color very slowly in dilute HCl and slowly in concentrated HCl at room temperature, but does not dissolve.

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 BarwooditeHide

This section is currently hidden. Click the show button to view.

References for BarwooditeHide

This section is currently hidden. Click the show button to view.

Reference List:

Kampf, Anthony R., Celestian, Aaron J., Nash, Barbara P. (2018) Barwoodite, Mn2+6(Nb5+,□)2(SiO4)2(O,OH)6, a New Member of the Welinite Group from Granite Mountain, Arkansas. The Canadian Mineralogist, 56 (5) 799-809 doi:10.3749/canmin.1800032

Localities for BarwooditeHide

This section is currently hidden. Click the show button to view.

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 section is currently hidden. Click the show button to view.

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.