Poldervaartite (original) (raw)

A valid IMA mineral species

About PoldervaartiteHide

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Formula:

CaCa[SiO3(OH)](OH)

Colour:

colourless, milky white, pink-white

Lustre:

Vitreous, Sub-Vitreous

Crystal System:

Orthorhombic

Name:

Name in honor of Arie Poldervaart (6 July 1918, Bandung, Indonesia – 28 October 1964, Manhattan, New York, USA), petrologist at Columbia University, New York. He made important contributions to the understanding of the South African Karoo dolerites and Archean rocks in the Kakamas area of northwest Cape Province.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:3252:6

50d3f63e-b407-431c-a3f5-081892ff328a

IMA Classification of PoldervaartiteHide

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IMA Formula:

Ca(Ca,Mn)(SiO3OH)(OH)

Type description reference:

Classification of PoldervaartiteHide

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9.AF.90

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

78.1.8.1

78 : Unclassified Silicates
1 : Miscellaneous

Mineral SymbolsHide

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

Pronunciation of PoldervaartiteHide

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Pronunciation:

Physical Properties of PoldervaartiteHide

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Transparency:

Transparent, Translucent

Comment:

Vitreous on fractures

Colour:

Colourless, milky white, pink-white

Density:

2.91(2) g/cm3 (Measured) 2.9 g/cm3 (Calculated)

Optical Data of PoldervaartiteHide

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RI values:

_n_α = 1.634 _n_β = 1.640 _n_γ = 1.656

2V:

Measured: 63° to 65°, Calculated: 64°

δ = 0.022

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

Comments:

X= colorless
Y= light gray
Z= bluish gray

Chemistry of PoldervaartiteHide

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Mindat Formula:

CaCa[SiO3(OH)](OH)

Common Impurities:

Fe,Mg,H2O

Crystallography of PoldervaartiteHide

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Crystal System:

Orthorhombic

Class (H-M):

m m m _(_2/_m_2/_m_2/m ) - Dipyramidal

Cell Parameters:

a = 9.398(1) Å, b = 9.139(2) Å, c = 10.535(2) Å

Ratio:

a:b:c = 1.028 : 1 : 1.153

Unit Cell V:

904.83 ų (Calculated from Unit Cell)

Morphology:

Prismatic, sheaves

Crystal StructureHide

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0001615	Poldervaartite	Dai Y S, Harlow G E, McGhie A R (1993) Poldervaartite, Ca(Ca0.5Mn0.5)(SiO3OH)(OH), a new acid nesosilicate from the Kalahari manganese field, South Africa: Crystal structure and description American Mineralogist 78 1082-1087		1993	0	293
0009148	Poldervaartite	Heller L (1952) The structure of dicalcium silicate alpha-hydrate Acta Crystallographica 5 724-728		1952	synthetic Ca2SiO3OHOH	0	293
0010286	Poldervaartite	Yano T, Urabe K, Ikawa H, Teraushi T, Ishizawa N, Udagawa S (1993) Structure of alpha-dicalcium silicate hydrate Acta Crystallographica C49 1555-1559		1993	0	293
0010292	Poldervaartite	Marsh R E (1994) A revised structure for alpha-dicalcium silicate hydrate Acta Crystallographica C50 996-997		1994	synthetic Ca2SiO3OHOH	0	293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Radiation - Copper Kα

Data Set:

Data courtesy of RRUFF project at University of Arizona, used with permission.

Powder Diffraction Data:

Geological EnvironmentHide

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Geological Setting:

In massive manganese ore.

Type Occurrence of PoldervaartiteHide

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General Appearance of Type Material:

Colorless to milky white wheat-sheaf polycrystals and euhedral crystals.

Place of Conservation of Type Material:

American Museum Natural History, New York, USA, T100728

Geological Setting of Type Material:

Alteration of low-grade Mn-rich metasediments by hydrothermal fluids rich in Ca, Si02, and C02.

Associated Minerals at Type Locality:

Reference:

Dai, Y.S., Harlow, G.E., McGhie, A.R. (1993) Poldervaartite, Ca(Ca0.5Mn0.5)(SiO3OH)(OH), a new acid nesosilicate from the Kalahari manganese field, South Africa: Crystal structure and description. American Mineralogist: 78: 1082-1087.

Synonyms of PoldervaartiteHide

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Other Language Names for PoldervaartiteHide

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Relationship of Poldervaartite to other SpeciesHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of PoldervaartiteHide

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Other InformationHide

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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 PoldervaartiteHide

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References for PoldervaartiteHide

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Reference List:

Bonazzi, P., Bindi, L., Medenbach, O., Pagano, R., Lampronti, Menchetti, S. (2007): Olmiite, CaMnSiO3(OH), the Mn-dominant analogue of poldervaartite, a new mineral species from Kalahari manganese fields (Republic of South Africa), Mineralogical Magazine: 71: 193-291.

Localities for PoldervaartiteHide

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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

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- 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.