Vladimirite: Difference between revisions

Vladimirite
Vladimirite
General
Category	Arsenate minerals
Formula; (repeating unit)	Ca5(HAsO4)2(AsO4)2·5H2O
IMA symbol	Vld
Strunz classification	8.CJ.25
Crystal system	Monoclinic
Crystal class	Prismatic (2/m) ; (same H-M symbol)
Space group	P21/c
Unit cell	a = 5.81 Å, b = 10.19 Å ; c = 22.7 Å; β = 97.32°; Z = 3
Identification
Formula mass	848.16 g/mol
Color	Pale rose, colorless, white
Crystal habit	As acicular/bladed crystals occurring in cross-fiber veinlets; spherulitic
Twinning	Penetration
Cleavage	Good one plane
Tenacity	Brittle
Mohs scale hardness	3.5
Luster	Sub-vitreous, silky, pearly
Streak	White
Diaphaneity	Transparent
Specific gravity	3.17
Optical properties	Biaxial (-)
Refractive index	nα = 1.650 - 1.651 nβ = 1.654 - 1.656 nγ = 1.656 - 1.661
Birefringence	δ = 0.006 - 0.010
Pleochroism	Non-pleochroic
2V angle	Measured: 70°
References

Browse history interactively

← Previous edit

Content deleted Content added

VisualWikitext

Inline

Latest revision as of 03:18, 19 February 2023

Vladimirite is a rare calcium arsenate mineral with a formula of Ca₅(HAsO₄)₂(AsO₄)₂·5H₂O. It is named after the Vladimirovskoye deposit in Russia, where it was discovered in the 1950s.

Vladimirite is monoclinic-prismatic, which means crystallographically, it contains three axes of unequal length and the angles between two of the axes are 90 degrees, and one is less than 90 degrees. It belongs to the space group P2₁/c. The mineral also has an orthorhombic polytype. In terms of its optical properties, vladimirite is anisotropic which means the velocity of light varies depending on direction through the mineral. Relief is a diagnostic characteristic of a mineral in plane polarized light that refers to the various ways different minerals "stand out". Vladimirite's calculated relief is 1.65-1.661, which is moderate. It is colorless in plane polarized light, and it is weakly pleochroic. Pleochroism is the variety of colors under plane polarized light displayed by crystals at various angles.

Occurrence

Vladimirite was first described in 1953 at two deposits in Russia, the Khovu-Aksy nickel-cobalt deposit, Tuva Republic, and the Vladimirovskoye cobalt deposit, Altai Mountains, Altaiskii Krai, Siberia.^[4] It is a secondary mineral in the oxidized zone of arsenic-bearing ore deposits. It occurs with picropharmacolite, erythrite and aragonite. It has been reported from the Richelsdorf Mountains, Hesse, Germany; the Bou Azzer district, Morocco and the Mohawk mine, Keweenaw County, Michigan.^[2]

References

^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
^ ^a ^b Handbook of Mineralogy
^ Catti, and M., Ivaldi, G.(1981) Mechanism of the Reaction Ferrasite (Dimorph of Vladimirite) and Structure of the Latter Phase, B 157, 119-130
^ ^a ^b Mindat.org
^ Webmineral

This article about a specific mineral or mineraloid is a stub. You can help Wikipedia by expanding it.

[1] Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.

[HBM-2] Handbook of Mineralogy

[3] Catti, and M., Ivaldi, G.(1981) Mechanism of the Reaction Ferrasite (Dimorph of Vladimirite) and Structure of the Latter Phase, B 157, 119-130

[Mindat-4] Mindat.org

[5] Webmineral

[1]

[2]

[3]

[4]

[5]

@@ Line 1: / Line 1: @@
 {{Infobox mineral
 | name        = Vladimirite
-| category    =
+| category    = [[Arsenate minerals]]
 | boxwidth    =
 | boxbgcolor  =
-| image       =
+| image       = Vladimirite-87047.jpg
-| imagesize   =
+| imagesize   = 260px
 | caption     =
-| formula     = Ca5 [(HAsO4)2|(AsO4)2]•5H2O
+| formula     = Ca<sub>5</sub>(HAsO<sub>4</sub>)<sub>2</sub>(AsO<sub>4</sub>)<sub>2</sub>·5H<sub>2</sub>O
+| IMAsymbol   = Vld<ref>{{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}}</ref>
-| symmetry    = monoclinic
-| unit cell   = V 1,332.98 Å³
+| molweight   = 848.16 g/mol
-| molweight   =848.16 gm
+| strunz      = 8.CJ.25
-| color       = pale rose, colorless, white
+| system      = [[Monoclinic]]
+| class       = Prismatic (2/m) <br/><small>(same [[H-M symbol]])</small>
-| habit       = radial
-| system      = monoclinic
+| symmetry    = ''P''2<sub>1</sub>/c
+| unit cell   = a = 5.81&nbsp;[[Ångström|Å]], b = 10.19&nbsp;Å <br/>c = 22.7&nbsp;Å; β = 97.32°; Z&nbsp;=&nbsp;3
-| twinning    = penetration
+| color       = Pale rose, colorless, white
-| cleavage    = good
+| habit       = As acicular/bladed crystals occurring in cross-fiber veinlets; spherulitic
-| fracture    = fibrous
-| tenacity    =brittle
+| twinning    = Penetration
+| cleavage    = Good one plane
+| fracture    =
+| tenacity    = Brittle
 | mohs  = 3.5
-| luster      = vitreous(glassy)
+| luster      = Sub-vitreous, silky, pearly
+| refractive  = n<sub>α</sub> = 1.650 - 1.651 n<sub>β</sub> = 1.654 - 1.656 n<sub>γ</sub> = 1.656 - 1.661
-| refractive  = 1.65-1.66
-| opticalprop = biaxial
+| opticalprop = Biaxial (-)
-| birefringence = δ = 0.011
+| birefringence = δ = 0.006 - 0.010
-| pleochroism = trichroic
+| pleochroism = Non-pleochroic
+| 2V = Measured: 70°
-| streak      = white
-| gravity     = 3.17gm/cc
+| streak      = White
-| density     = 3.14gm
+| gravity     = 3.17
+| density     =
 | melt        =
 | fusibility  =
 | diagnostic  =
 | solubility  =
-| diaphaneity = transparent
+| diaphaneity = Transparent
 | other       =
+| references  = <ref name=HBM>[http://rruff.geo.arizona.edu/doclib/hom/vladimirite.pdf Handbook of Mineralogy]</ref><ref>Catti, and M., Ivaldi, G.(1981) Mechanism of the Reaction Ferrasite (Dimorph of Vladimirite) and Structure of the Latter Phase, B 157, 119-130</ref><ref name=Mindat>[http://www.mindat.org/min-4195.html Mindat.org]</ref><ref>[http://webmineral.com/data/Vladimirite.shtml Webmineral]</ref>
-| references  =
-<ref>^Roberts, W.C., Campbell, T.J., and Rapp Jr., G.R.
-(1990) Encyclopedia of minerals(2nd edition).294p. Library of Congress cataloging, Washington, D.C.</ref>
-<ref>http://euromin.w3sites.net/mineraux/VLADIMIRITE.html</ref>
-<ref>http://www.mindat.org/min-4195.html</ref>
-<ref>http://www.minsocam.org/ammin/AM40/AM40_551.pdf</ref>
-<ref>http://webmineral.com/specimens/picshow.php?id=2552&target=Vladimirite</ref>
-<ref>http://webmineral.com/data/Vladimirite.shtml></ref>
 }}
-'''Vladimirite''' has a general [[chemical formula]] of Ca<sub>5</sub> [(HAsO<sub>4</sub>)<sub>2</sub>|(AsO<sub>4</sub>)2]·5H<sub>2</sub>O.  It is named after the Vladimirovskoye [[Deposition (geology)|deposit]] in [[Russia]], where it was discovered in the 1950s.  Vladimirite is a secondary mineral in the oxidized zone of arsenic-bearing mineral deposits.  Vladimirite is monoclinic-prismatic, which means crystallographically, it contains three axes of unequal length and the angles between two of the axes are 90 degrees, and one is less than 90 degrees.  It belongs to the space group P2<sub>1</sub>/c.  The mineral also has an orthorhombic polytype
+'''Vladimirite''' is a rare [[calcium]] [[arsenate mineral]] with a [[chemical formula|formula]] of Ca<sub>5</sub>(HAsO<sub>4</sub>)<sub>2</sub>(AsO<sub>4</sub>)<sub>2</sub>·5H<sub>2</sub>O.  It is named after the Vladimirovskoye [[Deposition (geology)|deposit]] in [[Russia]], where it was discovered in the 1950s.
+Vladimirite is [[monoclinic]]-prismatic, which means crystallographically, it contains three axes of unequal length and the angles between two of the axes are 90 degrees, and one is less than 90 degrees.  It belongs to the space group P2<sub>1</sub>/c.  The mineral also has an orthorhombic [[Polymorphism (materials science)|polytype]].  In terms of its optical properties, vladimirite is anisotropic which means the velocity of light varies depending on direction through the mineral.  Relief is a diagnostic characteristic of a mineral in plane polarized light that refers to the various ways different minerals "stand out".  Vladimirite's calculated relief is 1.65-1.661, which is moderate.  It is colorless in plane polarized light, and it is weakly pleochroic. Pleochroism is the variety of colors under plane polarized light displayed by crystals at various angles.
+==Occurrence==
+Vladimirite was first described in 1953 at two deposits in Russia, the Khovu-Aksy nickel-cobalt deposit, [[Tuva Republic]], and the Vladimirovskoye cobalt deposit, [[Altai Mountains]], [[Altaiskii Krai]], Siberia.<ref name=Mindat/>
+It is a secondary mineral in the [[Redox|oxidized]] zone of arsenic-bearing [[ore]] deposits. It occurs with [[picropharmacolite]], [[erythrite]] and [[aragonite]]. It has been reported from the [[Richelsdorf Mountains]], [[Hesse]], [[Germany]]; the Bou Azzer district, [[Morocco]] and the Mohawk mine, [[Keweenaw County, Michigan]].<ref name=HBM/>
 == References ==
@@ Line 48: / Line 51: @@
 [[Category:Calcium minerals]]
+[[Category:Arsenate minerals]]
+[[Category:Monoclinic minerals]]
+[[Category:Minerals in space group 14]]
+{{mineral-stub}}