Hewettite (original) (raw)
A valid IMA mineral species - grandfathered
About HewettiteHide
This section is currently hidden. Click the show button to view.
Colour:
Deep red; chocolate brown (upon exposure); red to orange in transmitted light
Specific Gravity:
2.51 - 2.61
Crystal System:
Monoclinic
Name:
Named in honor of Donnel Foster Hewett (June 24, 1881, Irwin, Pennsylvania - February 5, 1971), U.S. Geological Survey, who studied the mineralogy of Mina Ragra, Cerro de Pasco, Peru. He was primarily responsible for the discovery of that, the largest vanadium deposit in the world.
A secondary mineral resulting from the alteration of patronite (TL), or from the alteration of less-oxidized vanadium minerals.
May reversibly dehydrate to metahewettite.
Unique IdentifiersHide
This section is currently hidden. Click the show button to view.
Long-form identifier:
mindat:1:1:1890:2
25090daf-fa1f-4dc8-9f53-260253923c99
IMA Classification of HewettiteHide
This section is currently hidden. Click the show button to view.
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
CaV5+6O16 · 9H2O
Type description reference:
Classification of HewettiteHide
This section is currently hidden. Click the show button to view.
4.HE.15
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
E : Phyllovanadates
47.3.1.1
47 : VANADIUM OXYSALTS
3 : Hydrated Normal Vanadium Oxysalts
21.2.4
21 : Vanadates (and vanadates with arsenate or phosphate)
2 : Vanadates of Mg, Ca, Sr or Ba
Mineral SymbolsHide
This section is currently hidden. Click the show button to view.
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Hew | 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 HewettiteHide
This section is currently hidden. Click the show button to view.
Colour:
Deep red; chocolate brown (upon exposure); red to orange in transmitted light
Density:
2.51 - 2.61 g/cm3 (Measured) 2.67 g/cm3 (Calculated)
Optical Data of HewettiteHide
This section is currently hidden. Click the show button to view.
RI values:
_n_α = 1.770 _n_β = 2.180 _n_γ = 2.350 - 2.400
δ = 0.580 - 0.630
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Dispersion:
r > v distinct
Optical Extinction:
Parallel. Z = c.
Comments:
X = Y = Light yellow-orange; Z = Dark red.
Chemistry of HewettiteHide
This section is currently hidden. Click the show button to view.
Mindat Formula:
CaV6O16 · 9H2O
Crystallography of HewettiteHide
This section is currently hidden. Click the show button to view.
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 12.29 Å, b = 3.59 Å, c = 11.174 Å
β = 97.24°
Ratio:
a:b:c = 3.423 : 1 : 3.113
Unit Cell V:
489.08 ų (Calculated from Unit Cell)
Morphology:
Crystals acicular and as fibers, elongated and intertwined parallel [010]; nodular aggregates, fracture fillings, and coatings.
Crystal StructureHide
This section is currently hidden. Click the show button to view.
Load
Unit Cell |Unit Cell Packed
2x2x2 |3x3x3 |4x4x4
Show
Big Balls |Small Balls |Just Balls |Spacefill
Polyhedra Off |Si Polyhedra |All Polyhedra
Remove metal-metal sticks
Display Options
Black Background |White Background
Perspective On |Perspective Off
2D |Stereo |Red-Blue |Red-Cyan
View
CIF File Best |x |y |z |a |b |c
Rotation
Stop |Start
Labels
Console Off |On |Grey |Yellow
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005224 | Hewettite | Evans H T (1989) The crystal structure of hewettite The Canadian Mineralogist 27 181-188 |  |
1989 | Colorado Plateau, USA | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
This section is currently hidden. Click the show button to view.
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 11.03 Å | (100) |
| 5.63 Å | (12) |
| 5.53 Å | (35) |
| 3.660 Å | (14) |
| 3.091 Å | (20) |
| 2.574 Å | (12) |
| 2.164 Å | (25) |
Comments:
Monument No. 2 mine, Arizona, USA. The data are from Bayliss (1982).
Geological EnvironmentHide
This section is currently hidden. Click the show button to view.
Geological Setting:
Colorado Plateau-type U-V deposits
Type Occurrence of HewettiteHide
This section is currently hidden. Click the show button to view.
General Appearance of Type Material:
Lumpy aggregates, composed of needles usually less than 0.01 x 0.2 mm.
Place of Conservation of Type Material:
U.S. National Museum of Natural History, Washington, D.C., USA: #87459.
Geological Setting of Type Material:
Very rich vanadium deposit in sedimentary rocks.
Associated Minerals at Type Locality:
Reference:
Hillebrand, W.F., Merwin, H.E., Wright, F.E. (1914) Hewettite, metahewettite and pascoite, hydrous calcium vanadates. Proceedings of the American Philosophical Society: 53: 31-54.
Other Language Names for HewettiteHide
This section is currently hidden. Click the show button to view.
Simplified Chinese:针钒钙石
Traditional Chinese:針釩鈣石
Relationship of Hewettite to other SpeciesHide
This section is currently hidden. Click the show button to view.
Other Members of this group:
Common AssociatesHide
This section is currently hidden. Click the show button to view.
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
This section is currently hidden. Click the show button to view.
| 4.HE.05 | Melanovanadite | Ca(V5+,V4+)4O10 · 5H2O | Tric. 1 : _P_1 |
|---|---|---|---|
| 4.HE.10 | Shcherbinaite | V5+2O5 | Orth. m m m _(_2/_m_2/_m_2/m ) : P m m n |
| 4.HE.15 | Metahewettite | CaV6O16 · 3H2O | Mon. 2/m |
| 4.HE.20 | Bariandite | Al0.6(V5+,V4+)8O20 · 9H2O | Mon. |
| 4.HE.20 | Bokite | (Al,Fe)1.3(V5+,V4+,Fe3+)8O20 · 7.5H2O | Mon. |
| 4.HE.20 | Corvusite | (Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 · 6-10H2O | Mon. 2/m : _B_2/m |
| 4.HE.20 | Fernandinite | (Ca,K)(V5+,V4+,Fe2+)8O20 · 10H2O | Mon. 2/m : _B_2/m |
| 4.HE.20 | Straczekite | (Ca,K,Ba)(V5+,V4+)8O20 · 3H2O | Mon. 2/m : _B_2/m |
| 4.HE.25 | Häggite | V3+V4+O2(OH)3 | Mon. 2/m : _B_2/m |
| 4.HE.30 | Doloresite | V4+3O4(OH)4 | Mon. 2/m : _B_2/m |
| 4.HE.35 | Duttonite | V4+O(OH)2 | Mon. 2/m |
| 4.HE.40 | Cavoite | CaV4+3O7 | Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a |
Other InformationHide
This section is currently hidden. Click the show button to view.
Thermal Behaviour:
When heated, it passes through various color changes and melts readily.
Notes:
Reversibly dehydrates to metahewettite. Slightly soluble in water.
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 HewettiteHide
This section is currently hidden. Click the show button to view.
References for HewettiteHide
This section is currently hidden. Click the show button to view.
Reference List:
Localities for HewettiteHide
This section is currently hidden. Click the show button to view.
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
This section is currently hidden. Click the show button to view.
- 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.