cobaltoblödite

{{Short description|Rare cobalt mineral}}

{{infobox mineral

| name = Cobaltoblödite

| category = Sulfate mineral

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| formula = Na₂Co(SO₄)₂·4H₂O

| IMAsymbol=Cblö{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}

| strunz =

| dana =

| system = Monoclinic

| class = Prismatic (2/m)
(same H-M symbol)

| symmetry = P2₁/a

| unit cell = a = 11.15, b = 8.27,
c = 5.54 [Å], β=100.52° (approximated); Z = 2

| color = Colorless (grains), reddish-pink (aggregates)

| colour =

| habit = Anhedral grains, in aggregates, forming crusts

| twinning =

| cleavage = None

| fracture = Uneven

| tenacity =

| mohs = 2.5

| luster = Vitreous

| streak = White

| diaphaneity = Transparent

| gravity = 2.29 (measured), 2.35 (calculated) (approximated)

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| opticalprop = Biaxal (-)

| refractive = nα=1.50, nβ=1.50, nγ=1.51 (approximated)

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| references = Kasatkin, A.V., Nestola, F., Plášil, J., Marty, J., Belakovskiy, D.I., Agakhanov, A.A., Mills, S.J., Pedron, D., Lanza, A., Favaro, M., Bianchin, S., Lykova, I.S., Goliáš, V., and Birch, W.D., 2013. Manganoblödite, Na₂Mn(SO₄)₂·4H₂O, and cobaltoblödite, Na₂Co(SO₄)₂·4H₂O: two new members of the blödite group from the Blue Lizard mine, San Juan County, Utah, USA. Mineralogical Magazine 77(3), 367-383

}}

Cobaltoblödite is a rare cobalt mineral with the formula Na₂Co(SO₄)₂·4H₂O.{{cite web |url=http://www.mindat.org/min-43582.html |title=Cobaltoblödite: Cobaltoblödite mineral information and data |website=Mindat.org |accessdate=2016-03-11}} Cobaltoblödite was found in the Blue Lizard mine, San Juan County, Utah, USA, which is known for secondary uranium minerals.{{cite web|url=http://www.mindat.org/loc-38665.html |title=Blue Lizard Mine, Chocolate Drop, Red Canyon, White Canyon District, San Juan Co., Utah, USA - Mindat.org |website=Mindat.org |accessdate=2016-03-10}} Cobaltoblödite occurs intimately intergrown with manganese-, cobalt- and nickel-enriched blödite and a yet another new mineral - manganoblödite. Cobaltoblödite, as suggested by its name is a cobalt-analogue of blödite. It is also analogous to changoite, manganoblödite and nickelblödite - other members of the blödite group.