Sveite
A valid IMA mineral species
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About Sveite
Sociedad Venezolana de Espeleologia
Formula:
(K3-x◻x)Al8(NO3)6O8Cl4 · nH2O
may represent more than a single species; formerly here as: KAl7(NO3)4(OH)16Cl2.8H2O; a more general formula, formulated in future, is likely
Colour:
White, colorless under the microscope
Hardness:
1
Specific Gravity:
2.0
Crystal System:
Monoclinic
Name:
From SVE, the acronym for the Sociedad Venezolana de Espeleologia, whose members collected the original specimen.
Type Locality:
May represent more than a single species: variable K and Cl contents are proved for sveite from different localities (Knaack et al., 2023).
Unique Identifiers
Mindat ID:
3838
Long-form identifier:
mindat:1:1:3838:2
GUID
(UUID V4):
(UUID V4):
627329e9-6b18-4d0a-842a-a6185205977d
IMA Classification of Sveite
Approved
IMA Formula:
KAl7(NO3)4(OH)16Cl2 · 8H2O
Approval year:
1980
First published:
1980
Classification of Sveite
5.ND.20
5 : CARBONATES (NITRATES)
N : NITRATES
D : With OH (etc.) and H2O
5 : CARBONATES (NITRATES)
N : NITRATES
D : With OH (etc.) and H2O
Dana 7th ed.:
19.2.3.1
19.1.3.1
19 : NITRATES CONTAINING HYDROXYL OR HALOGEN
1 : Anhydrous Nitrates Containing Hydroxyl or Halogen
19 : NITRATES CONTAINING HYDROXYL OR HALOGEN
1 : Anhydrous Nitrates Containing Hydroxyl or Halogen
13.8
13 : Nitrates
13 : Nitrates
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 |
|---|---|---|
| Sv | 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 Sveite
Transparency:
Translucent
Colour:
White, colorless under the microscope
Streak:
White
Hardness:
1 on Mohs scale
Comment:
Comparable to talc
Cleavage:
Perfect
Presumably {001}
Presumably {001}
Density:
2.0 g/cm3 (Measured) 2.185 g/cm3 (Calculated)
Comment:
Measured using sink-float method. Calculated using ideal formula.
Optical Data of Sveite
Type:
Biaxial (+)
RI values:
nα = 1.501 nβ = 1.503 nγ = 1.535
2V:
Calculated: 30°
Max Birefringence:
δ = 0.034
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:
Low
Dispersion:
relatively strong
Chemistry of Sveite
Mindat Formula:
(K3-x◻x)Al8(NO3)6O8Cl4 · nH2O
may represent more than a single species; formerly here as: KAl7(NO3)4(OH)16Cl2.8H2O; a more general formula, formulated in future, is likely
may represent more than a single species; formerly here as: KAl7(NO3)4(OH)16Cl2.8H2O; a more general formula, formulated in future, is likely
Crystallography of Sveite
Crystal System:
Monoclinic
Cell Parameters:
a = 10.89 Å, b = 13.04 Å, c = 30.71 Å
β = 92.10°
β = 92.10°
Ratio:
a:b:c = 0.835 : 1 : 2.355
Unit Cell V:
4,358.06 ų (Calculated from Unit Cell)
Z:
6
Comment:
Point Group: n.d.; Space Group: n.d.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.20 Å | (100) |
| 2.443 Å | (55) |
| 3.692 Å | (40) |
| 5.995 Å | (35) |
| 6.174 Å | (20) |
| 4.209 Å | (20) |
| 2.752 Å | (20) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] | |
| 47g : [Halogen-bearing surface weathering minerals] |
Type Occurrence of Sveite
General Appearance of Type Material:
White crusts and efflorescences.
Place of Conservation of Type Material:
University of Central Venezuela, Caracas, Venezuela.
The Natural History Museum, London, England, 1985,348.
National Museum of Natural History, Washington, D.C., USA, 162532.
The Natural History Museum, London, England, 1985,348.
National Museum of Natural History, Washington, D.C., USA, 162532.
Geological Setting of Type Material:
Cave with water seepage.
Associated Minerals at Type Locality:
Reference:
Martini, J.E.J. (1980) Sveite, a new mineral from Autana Cave, Territorio Federal Amazonas, Venezuela. Transactions of the Geological Society of South Africa: 83: 239-241.
Synonyms of Sveite
Other Language Names for Sveite
Common Associates
Related Minerals - Strunz-mindat Grouping
| 5.ND.05 | Likasite | Cu3(NO3)(OH)5 · 2H2O |
| 5.ND.10 | Mbobomkulite | (Ni,Cu)Al4((NO3)2,SO4)(OH)12 · 3H2O |
| 5.ND.15 | Hydrombobomkulite | (Ni,Cu)Al4((NO3)2,SO4)(OH)12 · 13-14H2O |
| 5.ND.25 | Lislkirchnerite | Pb6Al(OH)8Cl2(NO3)5 · 2H2O |
Other Information
Thermal Behaviour:
Produces red-brown fumes when heated in a test tube.
A strong endothermic peak at 240°C, including a shoulder at 200°C, corresponding to 49% loss in mass. Weak endothermic reactions at 400°C, representing about 6% loss (poorly distinct from previous loss). Weak and broad at 1000°C (3% loss), and weak at 1150°C (1% loss).
A strong endothermic peak at 240°C, including a shoulder at 200°C, corresponding to 49% loss in mass. Weak endothermic reactions at 400°C, representing about 6% loss (poorly distinct from previous loss). Weak and broad at 1000°C (3% loss), and weak at 1150°C (1% loss).
Notes:
Completely soluble in HCl and H2SO4 but dissolves with difficulty in HNO3. Gelatinous when moist. Highly hygroscopic, forming a residue of Al(OH)3.
Special Storage/
Display Requirements:
Display Requirements:
Highly hygroscopic, forming a residue of Al(OH)3.
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 Sveite
mindat.org URL:
https://www.mindat.org/min-3838.html
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References for Sveite
Reference List:
Localities for Sveite
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Australia | |
| May et al. (2015) |
Brazil | |
| Atencio et al. (2022) |
South Africa | |
| Miller et al. (2013) |
USA | |
| Graham et al. (1988) |
Venezuela (TL) | |
| Martini (1980) |
| Franco Urbani (2009) |
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Curitiba, Paraná, Brazil