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Ammoniolasalite
A valid IMA mineral species
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About Ammoniolasalite
Formula:
[(NH4)2Mg2(H2O)20] [V10O28]
Colour:
Bright orange to orange-yellow
Lustre:
Vitreous
Hardness:
1
Specific Gravity:
2.28
Crystal System:
Monoclinic
Member of:
Name:
The ammonium analogue of lasalite.
Type Locality:
Unique Identifiers
Mindat ID:
52841
Long-form identifier:
mindat:1:1:52841:4
Classification of Ammoniolasalite
The Decavanadate Cluster
The decavanadate cluster found in ammoniolasalite. The same cluster is known in a number of other secondary vanadium minerals including, for example, pascoite, wernerbaurite, and huemulite.
IMA Classification of Ammoniolasalite
Approved
IMA Formula:
(N3-H4)2Mg2[V5+10O28]·20H2O
Approval year:
2017
First published:
2018
Type description reference:
4.HC.
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
C : [6]-Sorovanadates
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
C : [6]-Sorovanadates
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 for Standard |
|---|---|---|
| Alas | 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 Ammoniolasalite
Vitreous
Transparency:
Transparent
Colour:
Bright orange to orange-yellow
Streak:
Light orange
Hardness:
1 on Mohs scale
Comment:
Based on scratch tests
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
2.28(2) g/cm3 (Measured) 2.278(2) g/cm3 (Calculated)
Comment:
Calculated 2.278 for the empirical formula and 2.271 for the ideal formula.
Optical Data of Ammoniolasalite
Type:
Biaxial (-)
RI values:
nα = 1.740(3) nβ = 1.769(3) nγ = 1.771(3)
2V:
Measured: 31° (1)
Max. Birefringence:
δ = 0.031
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
Dispersion is very strong, r > v
Pleochroism:
Visible
Comments:
X yellow, Y yellow orange, Z orange
X , Y , Z
X , Y , Z
Comments:
Y = b, Z Λ a = 38° in obtuse b.
Chemistry of Ammoniolasalite
Mindat Formula:
[(NH4)2Mg2(H2O)20] [V10O28]
Element Weights:
Crystallography of Ammoniolasalite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 24.478(3) Å, b = 10.9413(4) Å, c = 17.551(1) Å
β = 17.551(7)°
β = 17.551(7)°
Ratio:
a:b:c = 2.237 : 1 : 1.604
Unit Cell V:
1,417.47 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Short prismatic (on [101])to equant crystals, often exhibiting stepped or skeletal faces. Forms include {001}, {110}, {101},
{111}, {111}, {201}, and {311}.
{111}, {111}, {201}, and {311}.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.64 Å | (24) |
| 9.43 Å | (100) |
| 8.57 Å | (21) |
| 7.62 Å | (26) |
| 6.80 Å | (32) |
| 2.891 Å | (13) |
| 2.725 Å | (23) |
| 2.125 Å | (13) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47e : [Vanadates, chromates, manganates] | |
| 47h : [Near-surface oxidized, dehydrated minerals] | |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 55 : Anthropogenic mine minerals |
Type Occurrence of Ammoniolasalite
General Appearance of Type Material:
occurs as crusts on montroseite- and corvusite-bearing sandstone
Place of Conservation of Type Material:
Cotype material is deposited in the mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Blvd, Los Angeles, California, USA, catalogue numbers 67477, 67478, 67479, 67480 and 67481
Geological Setting of Type Material:
Sandstone uranium and vanadium occurrence
Associated Minerals at Type Locality:
Synonyms of Ammoniolasalite
Other Language Names for Ammoniolasalite
Relationship of Ammoniolasalite to other Species
Member of:
Other Members of Pascoite Family:
| Bluestreakite | K4Mg2(V4+2V5+8O28) · 14H2O | Mon. 2/m : P21/c |
| Burroite | Ca2(NH4)2(V10O28) · 15H2O | Tric. 1 : P1 |
| Caseyite | [(V5+O2)Al10-x(OH)20-2x(H2O)18-2x]2[H2V4+V5+9O28][V5+10O28]2(Na,K,Ca)2-y(SO4)2-z · (60+8x+y+4z)H2O (x = 0-2.5; y = 0-2; z = 0-2) | Mon. 2/m : P21/c |
| Flatimerite | [Al13(OH)24(H2O)24][V5+9V4+O28] · [(SO4)4(H2O)24] | Tric. 1 : P1 |
| Gunterite | Na4Ca(V10O28) · 20H2O | Mon. 2/m : B2/m |
| Huemulite | Na4Mg(V10O28) · 24H2O | Tric. |
| Hughesite | Na3Al(V10O28) · 22H2O | Tric. 1 : P1 |
| Hummerite | K2Mg2(V10O28) · 16H2O | Tric. 1 : P1 |
| Hydropascoite | Ca3(V10O28) · 24H2O | Tric. 1 : P1 |
| Kokinosite | Na2Ca2(V10O28) · 24H2O | Tric. 1 : P1 |
| Lasalite | Na2Mg2(V10O28) · 20H2O | Mon. 2/m : B2/b |
| Magnesiopascoite | Ca2Mg(V10O28) · 16H2O | Mon. 2/m : B2/m |
| Nashite | Na3Ca2[(V5+9V4+)O28] · 24H2O | Mon. 2/m : P21/m |
| Okieite | Mg3[V10O28] · 28H2O | Tric. 1 : P1 |
| Pascoite | Ca2Ca(V10O28) · 17H2O | Mon. 2 : B2 |
| Postite | Mg(H2O)6Al2(OH)2(H2O)8(V10O28) · 13H2O | Orth. mmm(2/m2/m2/m) : Pccn |
| Protocaseyite | [Al4(OH)6(H2O)12][V10O28] · 8H2O | Tric. 1 : P1 |
| Rakovanite | (NH4)3Na3(V10O28) · 12H2O | Mon. 2/m : P21/c |
| Schindlerite | {(NH4)4Na2(H2O)10}{V10O28} | Tric. 1 : P1 |
| Trebiskyite | Na3Mg2[TiV9O28] · 22H2O | Mon. 2/m : P21/c |
| Wernerbaurite | {(NH4)2[Ca2(H2O)14](H2O)2}{V10O28} | Tric. 1 : P1 |
Common Associates
Associations Based on Photo Data:
| 2 photos of Ammoniolasalite associated with Corvusite | (Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 · 6-10H2O |
| 1 photo of Ammoniolasalite associated with Montroseite | (V3+,Fe3+)O(OH) |
| 1 photo of Ammoniolasalite associated with Hummerite | K2Mg2(V10O28) · 16H2O |
| 1 photo of Ammoniolasalite associated with Postite | Mg(H2O)6Al2(OH)2(H2O)8(V10O28) · 13H2O |
Related Minerals - Strunz-mindat Grouping
| 4.HC. | Protocaseyite | [Al4(OH)6(H2O)12][V10O28] · 8H2O |
| 4.HC. | Beckettite | Ca2V6Al6O20 |
| 4.HC. | Flatimerite | [Al13(OH)24(H2O)24][V5+9V4+O28] · [(SO4)4(H2O)24] |
| 4.HC.05 | Pascoite | Ca2Ca(V10O28) · 17H2O |
| 4.HC.05 | Hydropascoite | Ca3(V10O28) · 24H2O |
| 4.HC.05 | Lasalite | Na2Mg2(V10O28) · 20H2O |
| 4.HC.05 | Hughesite | Na3Al(V10O28) · 22H2O |
| 4.HC.05 | Magnesiopascoite | Ca2Mg(V10O28) · 16H2O |
| 4.HC.05 | Rakovanite | (NH4)3Na3(V10O28) · 12H2O |
| 4.HC.10 | Hummerite | K2Mg2(V10O28) · 16H2O |
| 4.HC.15 | Sherwoodite | Ca5.5(AlV4+V5+12O39) · 28H2O |
| 4.HC.20 | Bluestreakite | K4Mg2(V4+2V5+8O28) · 14H2O |
| 4.HC.25 | Wernerbaurite | {(NH4)2[Ca2(H2O)14](H2O)2}{V10O28} |
| 4.HC.25 | Burroite | Ca2(NH4)2(V10O28) · 15H2O |
| 4.HC.30 | Caseyite | [(V5+O2)Al10-x(OH)20-2x(H2O)18-2x]2[H2V4+V5+9O28][V5+10O28]2(Na,K,Ca)2-y(SO4)2-z · (60+8x+y+4z)H2O (x = 0-2.5; y = 0-2; z = 0-2) |
| 4.HC.35 | Gunterite | Na4Ca(V10O28) · 20H2O |
| 4.HC.40 | Kokinosite | Na2Ca2(V10O28) · 24H2O |
| 4.HC.45 | Nashite | Na3Ca2[(V5+9V4+)O28] · 24H2O |
| 4.HC.50 | Okieite | Mg3[V10O28] · 28H2O |
| 4.HC.55 | Postite | Mg(H2O)6Al2(OH)2(H2O)8(V10O28) · 13H2O |
| 4.HC.60 | Schindlerite | {(NH4)4Na2(H2O)10}{V10O28} |
Fluorescence of Ammoniolasalite
does not exhibit fluorescence in long- or short-wave ultraviolet light
Other Information
Notes:
At room temperature ammoniolasalite is slowly soluble in H2O (minutes) and rapidly soluble in dilute HCl (seconds).
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 Ammoniolasalite
mindat.org URL:
https://www.mindat.org/min-52841.html
Please feel free to link to this page.
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References for Ammoniolasalite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2018) New minerals and nomenclature modifications approved in 2018. Mineralogical Magazine, 82 (2). 445-451 doi:10.1180/mgm.2018.71p.446
Localities for Ammoniolasalite
Showing 3 localities.
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.
USA | |
| In the collection of Alex Earl |
| Kampf et al. (2018) +1 other reference |
| Joe Marty Collection |
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Burro Mine, San Miguel County, Colorado, USA