Caresite
A valid IMA mineral species
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About Caresite
Steve and Janet Cares
Formula:
Fe2+4Al2(OH)12[CO3] · 3H2O
Colour:
Green-black
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
2.59
Crystal System:
Trigonal
Member of:
Name:
Named after Steve Cares (1909-2006) and Janet Cares (1921-2011) of Sudbury, Massachusetts, USA, who found the mineral. They were inducted into the Micromounters Hall of Fame in 1999.
Only known as 3T polytype.
Unique Identifiers
Mindat ID:
6848
Long-form identifier:
mindat:1:1:6848:8
Similar Names
| Cerasite (of Breithaupt) | A synonym of Mendipite | |
| Cerasite (of Kikuchi) | ||
| Cerussite | A valid IMA mineral species - grandfathered | PbCO3 |
| Coracite | A variety of 'Gummite' | |
| Corsite | A synonym of 'Napoleonite' | |
| Crossite | A discredited species name | |
| Crucite (of Delamétherie) | A synonym of 'Chiastolite' | |
| Crucite (of Thomson) | A synonym of 'Crucilite' | |
| Kyrosite | A synonym of 'Lonchidite' |
IMA Classification of Caresite
Approved
IMA Formula:
Fe2+4Al2(OH)12CO3·3H2O
Approval year:
1992
First published:
1997
Classification of Caresite
5.DA.40
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations
16b.7.16.3
16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
7 : Miscellaneous
16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
7 : Miscellaneous
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 |
|---|---|---|
| Cre | 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 Caresite
Vitreous
Transparency:
Transparent
Colour:
Green-black
Streak:
White
Hardness:
2 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{0001}
{0001}
Fracture:
Irregular/Uneven
Density:
2.59(1) g/cm3 (Measured) 2.59 g/cm3 (Calculated)
Optical Data of Caresite
Type:
Uniaxial (-)
RI values:
nω = 1.599(1) nε = 1.570(1)
Max. Birefringence:
δ = 0.029
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:
Moderate
Chemistry of Caresite
Mindat Formula:
Fe2+4Al2(OH)12[CO3] · 3H2O
Element Weights:
Crystallography of Caresite
Crystal System:
Trigonal
Class (H-M):
32 - Trapezohedral
Space Group:
P3112
Cell Parameters:
a = 10.805(3) Å, c = 22.48(3) Å
Ratio:
a:c = 1 : 2.081
Unit Cell V:
2273 ų
Z:
6
Twinning:
Twinned by rotation 180 deg around the c axis.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.49 Å | (100) |
| 3.746 Å | (50) |
| 2.625 Å | (40) |
| 2.314 Å | (50) |
| 1.948 Å | (40) |
| 1.729 Å | (10) |
| 1.631 Å | (10) |
| 1.558 Å | (15) |
| 1.526 Å | (20) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Caresite
Co-Type Localities:
General Appearance of Type Material:
Tabular and pyramidal crystals to 0.5 mm, forming irregular aggregates. Normally coated with a fine-grained smectite or with chamosite.
Place of Conservation of Type Material:
Canadian Museum of Nature, Ottawa, Ontario, Canada, CMNMI 81550. CMNMI 81551 and CMNMI 81552.
Royal Ontario Museum, Toronto, Ontario, Canada, M46772, M46773 and M46774.
Royal Ontario Museum, Toronto, Ontario, Canada, M46772, M46773 and M46774.
Geological Setting of Type Material:
Late-stage hydrothermal minerals in miarolitic cavities and in pegmatitic bodies within nepheline syenite.
Associated Minerals at Type Locality:
Synonyms of Caresite
Other Language Names for Caresite
Relationship of Caresite to other Species
Member of:
Other Members of Quintinite Group:
| Charmarite | Mn2+4Al2(OH)12[CO3] · 3H2O | Hex. |
| Chlormagaluminite | Mg4Al2(OH)12Cl2 · 3H2O | Hex. 6/mmm(6/m2/m2/m) : P63/mcm |
| Comblainite | Ni4Co2(OH)12[CO3] · 3H2O | Trig. |
| Liudongshengite | Zn4Cr2(OH)12(CO3) · 3H2O | Trig. 3m(32/m) : R3m |
| Quintinite | Mg4Al2(OH)12(CO3) · 3H2O | Hex. 622 : P6322 |
| 'Unnamed (Zn-analogue of Chlormagaluminite)' | Zn4Al2(OH)12Cl2 · 2H2O | |
| Zaccagnaite | Zn4Al2(OH)12[CO3] · 3H2O | Hex. |
Related Minerals - Strunz-mindat Grouping
| 5.DA. | Alexkhomyakovite | K6(Ca2Na)(CO3)5Cl · 6H2O |
| 5.DA. | Amoraite | Ca12Al6(OH)36(CO3)2(SO3) · 15H2O |
| 5.DA.05 | Dypingite | Mg5(CO3)4(OH)2 · 5H2O |
| 5.DA.05 | 'UM1986-10-CO:ClHMgMnZn (also called Mineral F, Dunn, 1995)' | Mg5(Zn,Mn)3(CO3)2(OH,Cl)12 · H2O |
| 5.DA.05 | 'UM1987-01-CO:HMgS' | Mg4(CO3)2(OH)4 · 6H2O ? |
| 5.DA.05 | Giorgiosite | Mg5(CO3)4(OH)2 · 5-6H2O |
| 5.DA.05 | Hydromagnesite | Mg5(CO3)4(OH)2 · 4H2O |
| 5.DA.05 | Widgiemoolthalite | Ni5(CO3)4(OH)2 · 5H2O |
| 5.DA.10 | Artinite | Mg2(CO3)(OH)2 · 3H2O |
| 5.DA.10 | Chlorartinite | Mg2(CO3)(OH)Cl · 2H2O |
| 5.DA.10 | Indigirite | Mg2Al2(CO3)4(OH)2 · 15H2O |
| 5.DA.15 | Zaratite | Ni3(CO3)(OH)4 · 4H2O ? |
| 5.DA.15 | Otwayite | Ni2(CO3)(OH)2 · H2O |
| 5.DA.20 | Kambaldaite | NaNi4(CO3)3(OH)3 · 3H2O |
| 5.DA.25 | Callaghanite | Cu2Mg2(CO3)(OH)6 · 2H2O |
| 5.DA.30 | Claraite | (Cu,Zn)15(CO3)4(AsO4)2(SO4)(OH)14 · 7H2O |
| 5.DA.35 | Hydroscarbroite | Al14(CO3)3(OH)36 · nH2O |
| 5.DA.35 | Scarbroite | Al5(CO3)(OH)13 · 5H2O |
| 5.DA.40 | Karchevskyite | Mg18Al9(OH)54Sr2(CO3)9(H2O)6(H3O)5 |
| 5.DA.40 | 'UM1987-05-OH:AlCMg' | Mg4Al2(OH)12(CO3,SO4) · 3H2O |
| 5.DA.40 | Quintinite | Mg4Al2(OH)12(CO3) · 3H2O |
| 5.DA.40 | Charmarite | Mn2+4Al2(OH)12[CO3] · 3H2O |
| 5.DA.45 | 'Hydrotalcite-2H' | Mg6Al2(CO3)(OH)16 · 4H2O |
| 5.DA.45 | 'Stichtite-2H' | Mg6(Cr,Al)2(CO3)(OH)16 · 4H2O |
| 5.DA.45 | Brugnatellite | Mg6Fe3+(CO3)(OH)13 · 4H2O |
| 5.DA.45 | Zaccagnaite | Zn4Al2(OH)12[CO3] · 3H2O |
| 5.DA.45 | 'Pyroaurite-2H' | Mg6Fe3+2(OH)16(CO3) · 4H2O |
| 5.DA.45 | Liudongshengite | Zn4Cr2(OH)12(CO3) · 3H2O |
| 5.DA.45 | Chlormagaluminite | Mg4Al2(OH)12Cl2 · 3H2O |
| 5.DA.50 | Pyroaurite | Mg6Fe3+2(OH)16[CO3] · 4H2O |
| 5.DA.50 | Takovite | Ni6Al2(OH)16[CO3] · 4H2O |
| 5.DA.50 | Reevesite | Ni6Fe3+2(OH)16(CO3) · 4H2O |
| 5.DA.50 | Kaznakhtite | Ni6Co3+2(CO3)(OH)16 · 4H2O |
| 5.DA.50 | Comblainite | Ni4Co2(OH)12[CO3] · 3H2O |
| 5.DA.50 | Marioantofilliite | [Cu4Al2(OH)12](CO3) · 3H2O |
| 5.DA.50 | Hydrotalcite | Mg6Al2(CO3)(OH)16 · 4H2O |
| 5.DA.50 | Stichtite | Mg6Cr3+2(OH)16[CO3] · 4H2O |
| 5.DA.50 | Desautelsite | Mg6Mn3+2(OH)16[CO3] · 4H2O |
| 5.DA.55 | Coalingite | Mg10Fe3+2(OH)24[CO3] · 2H2O |
| 5.DA.55 | Akopovaite | Al4Li2(OH)12(CO3)(H2O)3 |
| 5.DA.60 | Šlikite | Zn2Mg(CO3)2(OH)2 · 4H2O |
| 5.DA.65 | Marklite | Cu5(CO3)2(OH)6 · 6H2O |
Fluorescence of Caresite
None
Other Information
Notes:
Dissolves in 1:1 HCl, and is strongly attacked by 1:1 HNO3 and H2SO4, with effervescence.
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 Caresite
mindat.org URL:
https://www.mindat.org/min-6848.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Caresite
Reference List:
Chao, G. Y., Gault, R. A. (1997) Quintinite-2H, quintinite-3T, charmarite-2H, charmarite-3T and caresite-3T, a new group of carbonate minerals related to the hydrotalcite-manasseite group. The Canadian Mineralogist, 35 (6) 1541-1549
Localities for Caresite
Showing 2 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.
Canada (TL) | |
| Chao et al. (1997) |
| Chao et al. (1997) |
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Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada