Santite
A valid IMA mineral species
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About Santite
Formula:
K[B5O6(OH)4] · 2H2O
Colour:
Colourless
Lustre:
Vitreous
Specific Gravity:
1.74 (Calculated)
Crystal System:
Orthorhombic
Member of:
Name:
Named in honor of Giorgio Galgano Santi (15 April 1746, Montieri, Tuscany, Italy - 30 December 1823, Pienza, Tuscany, Italy), naturalist, Professor of Natural Sciences in Pisa, and director of the Museum of Natural History, Pisa.
Type Locality:
This page provides mineralogical data about Santite.
Unique Identifiers
Mindat ID:
3527
Long-form identifier:
mindat:1:1:3527:5
GUID
(UUID V4):
(UUID V4):
0cd63773-fc73-4796-a403-4372a63719ab
Classification of Santite
Approved
First published:
1970
Type description reference:
6.EA.10
6 : BORATES
E : Pentaborates
A : Neso-pentaborates
6 : BORATES
E : Pentaborates
A : Neso-pentaborates
26.5.2.1
26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
5 : Pentaborates
26 : HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
5 : Pentaborates
9.1.13
9 : Borates
1 : Borates of the alkalis and boric acid
9 : Borates
1 : Borates of the alkalis and boric acid
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Snt | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Santite
Optical Data of Santite
Type:
Biaxial (+)
RI values:
nα = 1.422(2) nβ = 1.435(2) nγ = 1.480(1)
2V:
Measured: 70°
Max Birefringence:
δ = 0.058
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
relatively strong
Chemical Properties of Santite
Formula:
K[B5O6(OH)4] · 2H2O
IMA Formula:
KB5O6(OH)4 · 2H2O
Elements listed:
Crystallography of Santite
Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Aba2
Cell Parameters:
a = 11.10(2) Å, b = 11.18(2) Å, c = 9.08(2) Å
Ratio:
a:b:c = 0.993 : 1 : 0.812
Unit Cell V:
1,126.81 ų (Calculated from Unit Cell)
Z:
4
Morphology:
aggregates; as an efflorescent crust.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0010569 | Santite | Zachariasen W H (1937) The crystal structure of potassium acid dihydronium pentaborate KH2(H3O)2B5O10, (potassium pentaborate tetrahydrate) Zeitschrift fur Kristallographie 98 266-274 | 1937 | synthetic | 0 | 293 | |
0018018 | Santite | Zachariasen W (1938) The crystal structure of potassium acid dihydronium pentaborate K H2 (H3 O)2 B5 O10, (potassium pentaborate tetrahydrate) _cod_database_code 1011124 Zeitschrift fur Kristallographie 98 266-274 | 1938 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.36 Å | (100) |
3.52 Å | (84) |
5.60 Å | (71) |
2.767 Å | (50) |
2.181 Å | (21) |
3.28 Å | (18) |
5.93 Å | (15) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
25 : Evaporites (prebiotic) | |
Stage 7: Great Oxidation Event | <2.4 |
45b : [Other oxidized fumarolic minerals] |
Type Occurrence of Santite
Place of Conservation of Type Material:
Mineralogical Museum, University of Pisa, Pisa, Italy
Associated Minerals at Type Locality:
Reference:
Merlino, S., Sartori, F. (1970) Santite, a New Mineral Phase from Larderello, Tuscany. Contributions to Mineralogy and Petrology: 27: 159-165.
Synonyms of Santite
Other Language Names for Santite
Relationship of Santite to other Species
Member of:
Other Members of this group:
Sborgite | Na[B5O6(OH)4] · 3H2O | Mon. 2/m : B2/b |
Structurally related to group(s):
Common Associates
Associated Minerals Based on Photo Data:
1 photo of Santite associated with Thénardite | Na2SO4 |
Related Minerals - Strunz-mindat Grouping
6.EA.05 | Sborgite | Na[B5O6(OH)4] · 3H2O |
6.EA.05 | Leucostaurite | Pb2[B5O9]Cl · 0.5H2O |
6.EA.10 | Ramanite-(Rb) | Rb[B5O6(OH)4] · 2H2O |
6.EA.10 | Ramanite-(Cs) | Cs[B5O6(OH)4] · 2H2O |
6.EA.15 | Ammonioborite | (NH4)2[B5O6(OH)4]2 · H2O |
6.EA.25 | Ulexite | NaCa[B5O6(OH)6] · 5H2O |
Other Information
Notes:
Soluble in H2O
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 Santite
mindat.org URL:
https://www.mindat.org/min-3527.html
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Please feel free to link to this page.
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References for Santite
Reference List:
Localities for Santite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
Italy | |
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Kazakhstan | |
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USA | |
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Eagle Borax Spring, Inyo County, California, USA