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Olmiite

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Formula:
CaMn2+[SiO3(OH)](OH)
Colour:
Pale to intense reddish pink.
Lustre:
Vitreous
Hardness:
5 - 5½
Specific Gravity:
3.05
Crystal System:
Orthorhombic
Name:
Named for Filippo Olmi (CNR, Centre di Studio per la Minerogenesi ela Geochimica Applicata, Florence, Italy)
Mn2+-dominant analogue of Poldervaartite.

A product of hydrothermal alteration.

Most (all?) "poldervaartites" seem to be olmiites, see http://www.mindat.org/mesg-7-104499.html.


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Classification of OlmiiteHide

Approved
Approval Year:
2006
9.AF.90

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

Pronounciation of OlmiiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of OlmiiteHide

Vitreous
Transparency:
Transparent
Colour:
Pale to intense reddish pink.
Streak:
White
Hardness:
5 - 5½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
3.05 g/cm3 (Measured)    3.102 g/cm3 (Calculated)
Comment:
Calculated value based on unit cell volume; a value of 3.109 from powder data.

Optical Data of OlmiiteHide

Type:
Biaxial (+)
RI values:
nα = 1.663(1) nβ = 1.672(1) nγ = 1.694(1)
2V:
Measured: 71° , Calculated: 66°
Max Birefringence:
δ = 0.031
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v distinct
Pleochroism:
Non-pleochroic

Chemical Properties of OlmiiteHide

Formula:
CaMn2+[SiO3(OH)](OH)
IMA Formula:
CaMnSiO3(OH)2

Crystallography of OlmiiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbca
Cell Parameters:
a = 9.249 Å, b = 9.076 Å, c = 10.342 Å
Ratio:
a:b:c = 1.019 : 1 : 1.139
Unit Cell V:
868 ų
Z:
8
Morphology:
Crystals minute. Aggregates resemble wheat sheaves.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.14 (60)
4.10 (30)
3.19 (100)
2.807 (35)
2.762 (30)
2.545 (35)
2.521 (30)
2.361 (40)

Type Occurrence of OlmiiteHide

Synonyms of OlmiiteHide

Other Language Names for OlmiiteHide

Relationship of Olmiite to other SpeciesHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Bultfonteinite105 photos of Olmiite associated with Bultfonteinite on mindat.org.
Calcite88 photos of Olmiite associated with Calcite on mindat.org.
Oyelite28 photos of Olmiite associated with Oyelite on mindat.org.
Quartz11 photos of Olmiite associated with Quartz on mindat.org.
Xonotlite11 photos of Olmiite associated with Xonotlite on mindat.org.
Celestine8 photos of Olmiite associated with Celestine on mindat.org.
Poldervaartite6 photos of Olmiite associated with Poldervaartite on mindat.org.
Pectolite5 photos of Olmiite associated with Pectolite on mindat.org.
Manganite4 photos of Olmiite associated with Manganite on mindat.org.
Hematite2 photos of Olmiite associated with Hematite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.AF.05SillimaniteAl2(SiO4)OOrth. mmm (2/m 2/m 2/m)
9.AF.10AndalusiteAl2(SiO4)OOrth. mmm (2/m 2/m 2/m) : Pnnm
9.AF.10KanonaiteMn3+Al(SiO4)OOrth. mmm (2/m 2/m 2/m) : Pnnm
9.AF.15KyaniteAl2(SiO4)OTric. 1 : P1
9.AF.20MulliteAl4+2xSi2-2xO10-xOrth. mmm (2/m 2/m 2/m) : Pbam
9.AF.20Krieselite(Al,Ga)2(GeO4)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
9.AF.23BoromulliteAl9BSi2O19Orth. mm2 : Cmc21
9.AF.25YoderiteMg(Al,Fe3+)3(SiO4)2O(OH)Mon. 2/m : P21/m
9.AF.30MagnesiostauroliteMg(Mg,Li)3(Al,Mg)18Si8O44(OH)4Mon. 2/m : B2/m
9.AF.30StauroliteFe2+2Al9Si4O23(OH)Mon. 2/m : B2/m
9.AF.30ZincostauroliteZn2Al9Si4O23(OH)Mon. 2/m : B2/m
9.AF.35TopazAl2(SiO4)(F,OH)2Orth. mmm (2/m 2/m 2/m)
9.AF.40NorbergiteMg3(SiO4)(F,OH)2Orth. mmm (2/m 2/m 2/m)
9.AF.45AlleghanyiteMn2+5(SiO4)2(OH)2Mon. 2/m : P21/b
9.AF.45Chondrodite(Mg,Fe2+)5(SiO4)2(F,OH)2Mon. 2/m : P21/b
9.AF.45ReinhardbraunsiteCa5(SiO4)2(OH,F)2Mon. 2/m : P21/b
9.AF.45KumtyubeiteCa5(SiO4)2F2Mon. 2/m : P21/b
9.AF.45HydroxylchondroditeMg5(SiO4)2(OH)2Mon. 2/m : P21/b
9.AF.50Humite(Mg,Fe2+)7(SiO4)3(F,OH)2Orth. mmm (2/m 2/m 2/m)
9.AF.50Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2Orth.
9.AF.50Unnamed (Ca-analogue of Humite)Ca7(SiO4)4F2Orth. mmm (2/m 2/m 2/m)
9.AF.55ClinohumiteMg9(SiO4)4F2Mon. 2/m : P21/b
9.AF.55SonoliteMn2+9(SiO4)4(OH)2Mon.
9.AF.55HydroxylclinohumiteMg9(SiO4)4(OH)2Mon. 2/m
9.AF.60LeucophoeniciteMn2+7(SiO4)3(OH)2Mon. 2/m : P21/b
9.AF.65Ribbeite(Mn2+,Mg)5(SiO4)2(OH)2Orth.
9.AF.70JerrygibbsiteMn2+9(SiO4)4(OH)2Orth. mmm (2/m 2/m 2/m) : Pbcn
9.AF.75FranciscaniteMn2+6(V5+,☐)2(SiO4)2(O,OH)6Hex.
9.AF.75ÖrebroiteMn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3Hex.
9.AF.75WeliniteMn2+6(W6+,Mg)2(SiO4)2(O,OH)6Trig. 3 : P3
9.AF.80EllenbergeriteMg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10Hex.
9.AF.85Chloritoid(Fe2+,Mg,Mn2+)Al2(SiO4)O(OH)2Mon. 2/m : B2/b
9.AF.85MagnesiochloritoidMgAl2(SiO4)O(OH)2Mon. 2/m : B2/b
9.AF.85Ottrélite(Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2Mon.
9.AF.90PoldervaartiteCaCa[SiO3(OH)](OH)Orth. mmm (2/m 2/m 2/m) : Pbca

Fluorescence of OlmiiteHide

Deep red (SW 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.

References for OlmiiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Bonazzi, P., Bindi, L., Medenbach, O., Pagano, R., Lampronti, Menchetti, S. (2007): Olmiite, CaMn[SiO3(OH)](OH), the Mn-dominant analogue of poldervaartite, a new mineral species from Kalahari manganese fields (Republic of South Africa), Mineralogical Magazine, 71, 193-291.

Internet Links for OlmiiteHide

Localities for OlmiiteHide

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.
South Africa
 
  • Northern Cape Province
    • Kalahari manganese field
      • Hotazel
http://www.mindat.org/mesg-7-104499.html.
      • Kuruman
        • N'Chwaning Mines
Bonazzi, P., Bindi, L., Medenbach, O., Pagano, R., Lampronti, Menchetti, S. (2007): Olmiite, CaMn[SiO3(OH)](OH), the Mn-dominant analogue of poldervaartite, a new mineral species from Kalahari manganese fields (Republic of South Africa), Mineralogical Magazine, 71, 193-291.
P.Rondelez
Sweden
 
  • Värmland
    • Filipstad
Mineral and/or Locality  
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