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Cassidyite

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Will Cassidy
Formula:
Ca2(Ni2+,Mg)(PO4)2 · 2H2O
Colour:
Pale green to bright green.
Hardness:
Crystal System:
Triclinic
Name:
Named by J.S. White, E.P. Henderson, and B. Mason in 1967 in honor of William A. Cassidy, geologist and professor of Geology and Planetary Science at the University of Pittsburgh. He recognized that Antarctica was the greatest repository of meteorites on earth and mapped the Wolf Creek crater in 1953. Cassidy Glacier in Antarctica is also named after him.
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Classification of CassidyiteHide

Approved
Approval Year:
1966
First Published:
1967
8.CG.05

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
40.2.2.4

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2 : AB2(XO4)2·xH2O
19.15.2

19 : Phosphates
15 : Phosphates of Ni

Pronounciation of CassidyiteHide

Pronounciation:
PlayRecorded byFrom
Jolyon & Katya RalphUnited Kingdom

Physical Properties of CassidyiteHide

Colour:
Pale green to bright green.
Hardness:
3½ on Mohs scale

Optical Data of CassidyiteHide

Type:
Biaxial
RI values:
nα = 1.640 - 1.650 nγ = 1.670
Max Birefringence:
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
relatively strong

Chemical Properties of CassidyiteHide

Formula:
Ca2(Ni2+,Mg)(PO4)2 · 2H2O
IMA Formula:
Ca2Ni(PO4)2 · 2H2O

Crystallography of CassidyiteHide

Crystal System:
Triclinic
Cell Parameters:
a = 5.71 Å, b = 6.73 Å, c = 5.41 Å
α = 96.83°, β = 107.37°, γ = 104.58°
Ratio:
a:b:c = 0.848 : 1 : 0.804
Unit Cell V:
187.74 ų (Calculated from Unit Cell)

Type Occurrence of CassidyiteHide

General Appearance of Type Material:
Thin crusts and small spherules.
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 119553, 119554A.
Geological Setting of Type Material:
Cavities and cracks in a weathered meteorite

Synonyms of CassidyiteHide

Other Language Names for CassidyiteHide

Relationship of Cassidyite to other SpeciesHide

Other Members of this group:
CollinsiteCa2(Mg,Fe2+)(PO4)2 · 2H2OTric. 1 : P1
FairfielditeCa2(Mn2+,Fe2+)(PO4)2 · 2H2OTric. 1 : P1
GaititeCa2Zn(AsO4)2 · 2H2OTric.
MesseliteCa2(Fe2+,Mn2+)(PO4)2 · 2H2OTric. 1 : P1
NeomesseliteA structural variety of messelite.Tric.
NickeltalmessiteCa2Ni(AsO4)2 · 2H2OTric. 1 : P1
ParabrandtiteCa2Mn2+(AsO4)2 · 2H2OTric.
TalmessiteCa2Mg(AsO4)2 · 2H2OTric.
Unnamed (Fe2+-analogue of Parabrandtite)Ca2Fe2+(AsO4)2 · 2H2O
β-RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2OTric.

Related Minerals - Nickel-Strunz GroupingHide

8.CG.05CollinsiteCa2(Mg,Fe2+)(PO4)2 · 2H2OTric. 1 : P1
8.CG.05FairfielditeCa2(Mn2+,Fe2+)(PO4)2 · 2H2OTric. 1 : P1
8.CG.05GaititeCa2Zn(AsO4)2 · 2H2OTric.
8.CG.05MesseliteCa2(Fe2+,Mn2+)(PO4)2 · 2H2OTric. 1 : P1
8.CG.05ParabrandtiteCa2Mn2+(AsO4)2 · 2H2OTric.
8.CG.05β-RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2OTric.
8.CG.05TalmessiteCa2Mg(AsO4)2 · 2H2OTric.
8.CG.05HilliteCa2(Zn,Mg)(PO4)2 · 2 H2OTric. 1 : P1
8.CG.10BrandtiteCa2(Mn2+,Mg)(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10WendwilsoniteCa2Mg(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.10ZincroseliteCa2Zn(AsO4)2 · 2H2OMon.
8.CG.10RruffiteCa2Cu(AsO4)2 · 2H2OMon. 2/m : P21/b
8.CG.15FerrilotharmeyeriteCa(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)Mon. 2/m : B2/m
8.CG.15LotharmeyeriteCa(Zn,Mn3+)2(AsO4)2 · 2(H2O,OH)Mon. 2/m : B2/m
8.CG.15MawbyitePb(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)Mon.
8.CG.15MounanaitePbFe3+2(VO4)2(OH,F)2Mon. 2/m : B2/m
8.CG.15ThometzekitePb(Cu,Zn)2(AsO4,SO4)2 · 2(H2O,OH)Mon. 2/m : B2/m
8.CG.15TsumcoritePbZn2(AsO4)2 · 2H2OMon.
8.CG.15CobaltlotharmeyeriteCa(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)Mon. 2/m : B2/m
8.CG.15CabalzariteCa(Mg,Al,Fe3+)2(AsO4)2(OH,H2O)2Mon. 2/m : B2/m
8.CG.15KrettnichitePbMn3+2(VO4)2(OH)2Mon. 2/m : B2/m
8.CG.15CobalttsumcoritePb(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)Mon. 2/m : B2/m
8.CG.15NickellotharmeyeriteCa(Ni,Fe3+,Co)2(AsO4)2 · 2(H2O,OH)Mon. 2/m : B2/m
8.CG.15ManganlotharmeyeriteCaMn3+2(AsO4)2(OH)2Mon. 2/m : B2/m
8.CG.15Schneebergite(Bi3+,Ca)(Co,Ni,Fe3+)2(AsO4)2(OH,H2O)2Mon. 2/m : B2/m
8.CG.15Nickelschneebergite(Bi3+,Ca)(Ni,Co,Fe3+)2(AsO4)2 · 2(OH,H2O)Mon. 2/m : B2/m
8.CG.20GartrellitePb(Cu,Fe3+,Zn)2(AsO4,SO4)2 · 2(H2O,OH)Tric. 1 : P1
8.CG.20HelmutwinkleritePb(Zn,Cu)2(AsO4)2 · 2H2OTric.
8.CG.20ZincgartrellitePb(Zn,Fe3+,Cu)2(AsO4)2 · 2(H2O,OH)Tric. 1 : P1
8.CG.20RappolditePb(Co,Ni,Zn)2(AsO4)2 · 2H2OTric.
8.CG.20PhosphogartrellitePb(Cu,Fe3+)2(PO4,AsO4)2 · 2(H2O,OH)Tric.
8.CG.20LukrahniteCa(Cu,Zn)(Fe3+,Zn)(AsO4)2 · 2(H2O,OH)Tric. 1 : P1
8.CG.25Pottsite(Pb3xBi4-2x)(VO4)4·H2O (0.8 < x < 1.0)Tet. 4/m : I41/a
8.CG.35NickeltalmessiteCa2Ni(AsO4)2 · 2H2OTric. 1 : P1

Related Minerals - Dana Grouping (8th Ed.)Hide

40.2.2.1FairfielditeCa2(Mn2+,Fe2+)(PO4)2 · 2H2OTric. 1 : P1
40.2.2.2MesseliteCa2(Fe2+,Mn2+)(PO4)2 · 2H2OTric. 1 : P1
40.2.2.3CollinsiteCa2(Mg,Fe2+)(PO4)2 · 2H2OTric. 1 : P1
40.2.2.5TalmessiteCa2Mg(AsO4)2 · 2H2OTric.
40.2.2.6GaititeCa2Zn(AsO4)2 · 2H2OTric.
40.2.2.7β-RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2OTric.
40.2.2.8ParabrandtiteCa2Mn2+(AsO4)2 · 2H2OTric.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

19.15.1ArupiteNi3(PO4)2 · 8H2OMon. 2/m : B2/m

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 CassidyiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
White, J.S., Henderson, E.P., Mason, B. (1967) Secondary minerals produced by weathering of the Wolf Creek meteorite. American Mineralogist: 52: 1190-1197.
Fleck, M., Kolitsch, U., Hertweck, B. (2002) Natural and synthetic compounds with kröhnkite-type chains: review and classification. Zeitschrift für Kristallographie: 217: 435-443.

Internet Links for CassidyiteHide

Localities for CassidyiteHide

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.
Australia (TL)
 
  • Western Australia
    • Halls Creek Shire
      • Carranya Station
AM 52 (1967), 1190; HB4 (2000); Song, Y., Moon, H. S., & Chon, H. T. (1995). New occurrence and characterization of Niserpentines in the Kwangcheon area, Korea. Clay Minerals, 30(3), 211-224.
Mineral and/or Locality  
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