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Charleshatchettite

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Charles Hatchett
Formula:
CaNb4O10(OH)2·8H2O
Colour:
White
Crystal System:
Monoclinic
Name:
Named in honor of Charles Hatchett (2 January 1765, London, UK – 10 March 1847, Chelsea, London, UK), chemist who discovered the element niobium.
Related to franconite and hochelagaite. Chemically similar to hochelagaite, but is distinguished from hochelagaite by its powder X‑ray diffraction patterns.
Charleshatchettite is a late-stage mineral, interpreted to have developed through the interaction of low-T (<150 °C) aqueous fluids with an alkali-, Nb-rich precursor under slightly reducing conditions and a highly alkaline pH (Haring et al. 2017)


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Classification of CharleshatchettiteHide

Approved
Approval Year:
2015
First Published:
2017

Physical Properties of CharleshatchettiteHide

Transparency:
Transparent, Translucent
Colour:
White

Optical Data of CharleshatchettiteHide

Type:
Biaxial (-)

Chemical Properties of CharleshatchettiteHide

Formula:
CaNb4O10(OH)2·8H2O
IMA Formula:
CaNb4O10(OH)2 · 8H2O

Crystallography of CharleshatchettiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 21.151(4) Å, b = 6.496(1) Å, c = 12.714(3) Å
β = 103.958(3)°
Ratio:
a:b:c = 3.256 : 1 : 1.957
Unit Cell V:
1,695.28 ų (Calculated from Unit Cell)
Morphology:
Globules (~0.15–0.20 mm in diameter) composed of radiating crystals with individual crystals having average dimensions of ~0.002 × 0.010 × 0.040 mm. Crystals are euhedral, bladed (flattened on [100]).

Occurrences of CharleshatchettiteHide

Paragenetic Mode(s):

Type Occurrence of CharleshatchettiteHide

General Appearance of Type Material:
White globules (~0.15–0.20 mm in diameter) composed of radiating crystals with individual crystals having average dimensions of ~0.002 × 0.010 × 0.040 mm
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Canadian Museum of Nature, Gatineau, Quebec, Canada J9J 3N7, catalogue number CMNMC 86894.
Empirical Formula of Type Material:
(Ca1.00Mg0.041.04(Nb3.62Ti0.32Si0.12Al0.024.08O10(OH)2·8H2O
Chemical Analysis of Type Material:
CaO7.96 %
MgO0.24 %
Al2O30.13 %
SiO21.04 %
TiO23.64 %
Nb2O568.07 %
H2O (calc)22.96 %
Total:104.04 %
Geological Setting of Type Material:
On a fracture surface of a nepheline syenite.
Associated Minerals at Type Locality:
Reference:
Haring, M.M.M. & McDonald, A.M. (2017) Charleshatchettite, CaNb4O10(OH)2·8H2O, a new mineral from Mont Saint-Hilaire, Québec, Canada: Description, Crystal-Structure Determination and Origin. American Mineralogist: 102: 2333–2340.

Synonyms of CharleshatchettiteHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for CharleshatchettiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Haring, M.M. and McDonald, A.M. (2015) Charleshatchettite, IMA 2015-048. CNMNC Newsletter No. 27, October 2015, page 1228. Mineralogical Magazine: 79: 1229–1236.
Haring, M.M.M. and McDonald, A.M. (2017) Charleshatchettite, CaNb4O10(OH)2·8H2O, a new mineral from Mont Saint-Hilaire, Québec, Canada: Description, Crystal-Structure Determination and Origin. American Mineralogist: 102: 2333–2340 https://doi.org/10.2138/am-2017-5926

Internet Links for CharleshatchettiteHide

Localities for CharleshatchettiteHide

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 locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada (TL)
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Haring, M.M. and McDonald, A.M. (2015) Charleshatchettite, IMA 2015-048. CNMNC Newsletter No. 27, October 2015, page 1228; Mineralogical Magazine, 79, 1229 –1236.; Haring, M.M.M. & McDonald, A.M. (2017): Charleshatchettite, CaNb4O10(OH)2·8H2O, a new mineral from Mont Saint-Hilaire, Québec, Canada: Description, Crystal-Structure Determination and Origin. American Mineralogist: 102: 2333–2340 https://doi.org/10.2138/am-2017-5926
Mineral and/or Locality  
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