Olmiite-Poldervaartite Series

A solid-solution series between two end-member minerals

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Photos of Olmiite-Poldervaartite Series (485)

Olmiite-Poldervaartite Series Gallery Search Photos of Olmiite-Poldervaartite Series

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Olmiite

N'Chwaning II Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa

Olmiite, etc.

N'Chwaning II Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa

Olmiite

N'Chwaning II Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa

Olmiite

N'Chwaning II Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa

Olmiite, etc.

N'Chwaning II Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa

Olmiite

N'Chwaning II Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa

Olmiite

N'Chwaning II Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa

Olmiite, etc.

N'Chwaning II Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa

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About Olmiite-Poldervaartite SeriesHide

Series Formula:

CaMn²⁺[SiO₃(OH)](OH) to CaCa[SiO₃(OH)](OH)

A series between Olmiite and Poldervaartite

Unique IdentifiersHide

Mindat ID:

38781

Long-form identifier:

mindat:1:1:38781:7

GUID
(UUID V4):

5f57dd86-5e15-4eb5-8337-52ef5dd5aa18

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Year	Locality	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		293
0009148	Poldervaartite	Heller L (1952) The structure of dicalcium silicate alpha-hydrate Acta Crystallographica 5 724-728	1952	synthetic Ca2SiO3OHOH	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		293
0010292	Poldervaartite	Marsh R E (1994) A revised structure for alpha-dicalcium silicate hydrate Acta Crystallographica C50 996-997	1994	synthetic Ca2SiO3OHOH	293
0014579	Olmiite	Bonazzi P, Bindi L, Medenbach O, Pagano R, Lampronti G I, 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 71 193-201	2007	N'Chwaning II mine, Republic of South Africa	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Poldervaartite'
loop_
_publ_author_name
'Dai Y S'
'Harlow G E'
'McGhie A R'
_journal_name_full 'American Mineralogist'
_journal_volume 78 
_journal_year 1993
_journal_page_first 1082
_journal_page_last 1087
_publ_section_title
;
 Poldervaartite, Ca(Ca0.5Mn0.5)(SiO3OH)(OH), a new acid nesosilicate from the
 Kalahari manganese field, South Africa: Crystal structure and description
;
_database_code_amcsd 0001615
_chemical_formula_sum 'Ca1.67 Mn.33 Si O5 H2'
_cell_length_a 9.398
_cell_length_b 9.139
_cell_length_c 10.535
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 904.833
_exptl_crystal_density_diffrn      2.865
_symmetry_space_group_name_H-M 'P b c a'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,1/2-y,1/2+z'
  '-x,1/2+y,1/2-z'
  '1/2-x,1/2+y,z'
  '1/2+x,1/2-y,-z'
  '1/2+x,y,1/2-z'
  '1/2-x,-y,1/2+z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Ca1   0.15406   0.49326   0.39021   1.00000 ?
Ca2   0.51266   0.33390   0.43048   0.67000 ?
Mn   0.51266   0.33390   0.43048   0.33000 ?
Si   0.32973   0.21515   0.65939   1.00000 ?
O-h1   0.25180   0.35020   0.57350   1.00000 ?
O2  -0.05590   0.35900   0.43680   1.00000 ?
O3   0.10200   0.71010   0.28290   1.00000 ?
O-h4   0.39650   0.54920   0.39800   1.00000 ?
O5   0.20190   0.39860   0.18930   1.00000 ?
H1   0.25700   0.07400   0.11700   1.00000   0.03000
H2  -0.08400   0.58800   0.17300   1.00000   0.03000
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Ca1 0.00900 0.01010 0.00840 -0.00040 0.00070 0.00030
Ca2 0.01010 0.01040 0.00980 -0.00220 -0.00030 -0.00040
Mn 0.01010 0.01040 0.00980 -0.00220 -0.00030 -0.00040
Si 0.00760 0.00750 0.00690 0.00020 -0.00020 -0.00040
O-h1 0.02800 0.01040 0.01400 0.00460 -0.00840 -0.00050
O2 0.00920 0.01450 0.01170 -0.00190 -0.00020 -0.00420
O3 0.01600 0.01340 0.00870 0.00220 0.00450 0.00430
O-h4 0.01180 0.01900 0.01600 -0.00120 -0.00020 0.00630
O5 0.01460 0.01450 0.01290 0.00440 0.00180 -0.00160