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Steedeite

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Tony Steede
Formula:
NaMn2[Si3BO9](OH)2
Colour:
Colorless to pale pink; white
Lustre:
Sub-Vitreous, Silky
Specific Gravity:
3.106 (Calculated)
Crystal System:
Triclinic
Name:
Named in 2013 by M. M. Haring and Andrew M. McDonald in honor of Anthony Hosford Steede, dedicated mineral collector and specialist in the minerals of Mont Saint-Hilaire, Quebec, Canada.
Closely related to the sérandite-pectolite series of the pyroxenoid group and is the first mineral found to contain single loop-branched dreier silicate chains.

Structurally similar to scheuchzerite and saneroite.



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Classification of SteedeiteHide

Approved
Approval Year:
2013
First Published:
2014

Physical Properties of SteedeiteHide

Sub-Vitreous, Silky
Transparency:
Transparent, Translucent
Colour:
Colorless to pale pink; white
Streak:
White
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
3.106 g/cm3 (Calculated)

Optical Data of SteedeiteHide

Type:
Biaxial

Chemical Properties of SteedeiteHide

Formula:
NaMn2[Si3BO9](OH)2

Crystallography of SteedeiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 6.837(1) Å, b = 7.575(2) Å, c = 8.841(2) Å
α = 99.91(3)°, β = 102.19(3)°, γ = 102.78 (2)°
Ratio:
a:b:c = 0.903 : 1 : 1.167
Unit Cell V:
424.81 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Acicular crystals.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.454(100)
7.234(39)
3.331(83)
3.081(38)
2.859(52)
2.823(80)
2.477(21)
2.169(25)

Type Occurrence of SteedeiteHide

General Appearance of Type Material:
Bundles of slightly radiating acicular crystals to 0.5 mm.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Royal Ontario Museum, Queen’s Park, Toronto, Ontario, Canada, catalogue number M56489
Geological Setting of Type Material:
Late-stage mineral in sodalite syenite
Associated Minerals at Type Locality:
Reference:
Haring, M.M.M., McDonald, A.M. (2014) Steedeite, NaMn2[Si3BO9](OH)2: Characterization, crystal-structure determination, and origin. Canadian Mineralogist: 52: 47-60.

Synonyms of SteedeiteHide

Fluorescence of SteedeiteHide

Weak pale green to pale yellow fluorescence under medium-wave radiation

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.

References for SteedeiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Haring, M., MacDonald, A.M. (2013) On the crystal structure of UK 79, a potentially new mineral from Mont Saint-Hilaire, QC. GAC-MAC Winnipeg 2013, Abstracts, p. 107. [http://www.gac.ca/wp/wp-content/uploads/2013/05/2013WinnipegGACMACAbstracts-merged.pdf]
Haring, M.M., McDonald, A.M. (2013) Steedeite, IMA 2013-052. CNMNC Newsletter No. 17, October 2013, page 3002; Mineralogical Magazine: 77: 2997-3005.
Haring, M.M.M., McDonald, A.M. (2014) Steedeite, NaMn2[Si3BO9](OH)2: Characterization, crystal-structure determination, and origin. Canadian Mineralogist: 52: 47-60.

Internet Links for SteedeiteHide

Localities for SteedeiteHide

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.
Canada (TL)
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Haring, M. & MacDonald, A.M. (2013): On the crystal structure of UK 79, a potentially new mineral from Mont Saint-Hilaire, QC. GAC-MAC Winnipeg 2013, Abstracts, p. 107. [http://www.gac.ca/wp/wp-content/uploads/2013/05/2013WinnipegGACMACAbstracts-merged.pdf]; Haring, M.M. and McDonald, A.M. (2013) Steedeite, IMA 2013-052. CNMNC Newsletter No. 17, October 2013, page 3002; Mineralogical Magazine, 77, 2997-3005; Haring, M.M.M. & McDonald A.M. (2014): Steedeite, NaMn2[Si3BO9](OH)2: Characterization, crystal-structure determination, and origin. Canadian Mineralogist, 52, 47-60.
Mineral and/or Locality  
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