Subclass: Phosphates

Physical geology

Sis

Done: Ravil Kurmangaliyev

Marzhan Karimova

Alina Kukarskikh

Cheked: Medet A.

Subclass: Phosphates

The Phosphate Class is made up of minerals with a basic chemical unit of tetrahedral (AO4) groups with a negative three (-3) charge. The A can be either Phosphorus, Arsenic, Vanadium or Antimony. The basic chemical unit can be combined with metal ions on a one to one ratio or usually in more complex combinations with other ions such as hydroxide groups (OH), uranyl groups (UO2), a halogen or even water molecules.

The typical phosphate is vitreous to dull, often strongly colored, above average in density, average in hardness (4-7), and low in index of refraction unless ions such as lead are present. All other properties are variable. Many interesting and beautiful mineral specimens come from this class and although a large number of minerals are known to belong to this class, only some of the members of the Apatite Group are considered common.

Name	Amblygonite	LiAl(PO4)F
Colour	Milk-white, yellow
Lustre	Sub-Vitreous, Resinous, Greasy, Pearly
Crystal system	Triclinic
Hardness	5½ - 6

Name	Montebrasite	LiAl(PO4)(OH)
Colour	White, colorless, gray
Lustre	Sub-Vitreous, Resinous, Greasy, Pearly
Crystal system	Triclinic
Hardness	5½ - 6

Name	Tavorite	LiFe3+(PO4)(OH)
Colour	Grass-green, yellow-green
Lustre	Sub-Vitreous, Resinous, Waxy, Greasy
Crystal system	Triclinic
Hardness

Name	Triplite	(Mn2+,Fe2+)2(PO4)(F,OH)
Colour	Brown, red-brown, dark
Lustre	Vitreous, Resinous
Crystal system	Monoclinic
Hardness	5 - 5½

Name	Zwieselite	(Fe2+,Mn2+)2(PO4)F
Colour	Dark brown; black
Lustre	Sub-Vitreous, Resinous, Greasy
Crystal system	Monoclinic
Hardness	5 - 5½

Name	Triploidite	(Mn2+,Fe2+)2(PO4)(OH)
Colour	Red-brown, light pink
Lustre	Sub-Adamantine, Sub-Vitreous, Resinous, Greasy
Crystal system	Monoclinic
Hardness	4½ - 5

Name	Wagnerite	(Mg,Fe2+)2(PO4)F
Colour	Yellow, brown, red
Lustre	Sub-Vitreous, Resinous, Greasy
Crystal system	Monoclinic
Hardness	5 - 5½

Name	Wolfeite	(Fe2+,Mn2+)2(PO4)(OH)
Colour	Red-brown to dark brown
Lustre	Sub-Adamantine, Sub-Vitreous, Resinous, Greasy
Crystal system	Monoclinic
Hardness	4½ - 5

Name	Stanĕkite	(Mn2+,Fe2+,Mg)Fe3+(PO4)O
Colour	Black
Lustre	Greasy
Crystal system	Monoclinic
Hardness	4 - 5

Name	Holtedahlite	Mg2(PO4)(OH)
Colour	Colorless
Lustre	Vitreous
Crystal system	Trigonal
Hardness	4½ - 5

Name	Satterlyite	(Fe2+,Mg,Fe)12(PO4)5(PO3OH)(OH,O)6
Colour	Light brown, pale yellow
Lustre
Crystal system	Trigonal
Hardness	4½ - 5

Name	Althausite	Mg4(PO4)2(OH,O)(F,☐)
Colour	Pale gray, reddish brown.
Lustre	Sub-Vitreous, Resinous
Crystal system	Orthorhombic
Hardness	3½ - 4

Name	Lipscombite	Fe2+Fe23+(PO4)2(OH)2
Colour
Lustre
Crystal system	Tetragonal
Hardness

Name	Richellite	CaFe23+(PO4)2(OH,F)2
Colour	Yellow to yellow-brown
Lustre
Crystal system	Amorphous
Hardness	2 - 3

Name	Zinclipscombite	ZnFe23+(PO4)2(OH)2
Colour	dark green to brown
Lustre
Crystal system	Tetragonal
Hardness

Name	Libethenite	Cu2(PO4)(OH)
Colour	Light to dark green
Lustre	Sub-Vitreous, Resinous, Waxy, Greasy
Crystal system	Orthorhombic
Hardness

Name	Zincolibethenite	CuZn(PO4)(OH)
Colour	Bright green, bluish tint
Lustre
Crystal system	Orthorhombic
Hardness

Name	Tarbuttite	Zn2(PO4)(OH)
Colour	White, colourless
Lustre	Vitreous, Pearly
Crystal system	Triclinic
Hardness	3½

Name	Barbosalite	Fe2+Fe23+(PO4)2(OH)2
Colour	Black to dark
Lustre	Vitreous, Sub-Vitreous, Resinous, Waxy, Greasy, Dull
Crystal system	Monoclinic
Hardness	5½ - 6

Name	Hentschelite	CuFe23+(PO4)2(OH)2
Colour
Lustre
Crystal system	Monoclinic
Hardness	3½

Name	Lazulite	(Mg,Fe2+)Al2(PO4)2(OH)2
Colour	Blue, sky-blue, bluish
Lustre	Vitreous, Sub-Vitreous, Resinous, Greasy
Crystal system	Monoclinic
Hardness	5½ - 6

Name	Scorzalite	Fe2+Al2(PO4)2(OH)2
Colour	Dark azure blue
Lustre	Sub-Vitreous, Resinous, Greasy
Crystal system	Monoclinic
Hardness

Name	Trolleite	Al4(PO4)3(OH)3
Colour	Light green, colorless
Lustre	Vitreous
Crystal system	Monoclinic
Hardness	5½ - 6

Date: 2015-12-24; view: 1806