Here is the polytype signature of member in Qi.

A polytype of chesterite could be anthophyllite, which has a similar crystal structure.

Now the shape shifting of polymorphic values is not fully arbitrary but rather limited by their pristine polytype.

So the specialization introduces no further equivalence on polytype beside the already known renaming.

The mineral also has an orthorhombic polytype.

The 3T polytype, however, is not commonly pleochroic but can show green pleochroism if it is high in iron.

The unit cell parameters of wurtzite are (-2H polytype):

A study published in 2011 presented evidence that barbertonite is a polytype of stichite and should be discredited as a mineral species.

A function with polytype by contrast can map any value of the same type to itself, and the identity function is a value for this type.

The mineral also has an orthorhombic polytype (nabalamprophyllite-2O) This mineral belongs to the space group Pnmn.

From studies done on mica flakes from the Maantienvarsi sample, the mineral is a two layer-type modification of polytype 2M.

The procedure specializes the polytype by copying the term and replacing the bound type variables consistently by new monotype variables.

Nacrite AlSiO(OH) is a clay mineral that is a polymorph (or polytype) of kaolinite.

The 3T polytype was originally found in the Poudrette quarry at Mont Saint-Hilaire, which is a rare alkaline intrusive complex.

The 2H polytype is pleochroic, meaning that the mineral changes colors (in this case yellow and light yellow) when viewed at different angles under a polarizing petrographic microscope.

While this rule works well for any monotype uses as replacement, it fails when a polytype, say is tried as a replacement, resulting in the non-syntactical type .

Molybdenite crystallizes in the hexagonal crystal system as the common polytype 2H and also in the trigonal system as the 3R polytype.

Every polytype can have monoclinic (M) or hexagonal (H) symmetry, and therefore some sources label them, for example, not as 6C, but 6H or 6M depending on the symmetry.

It has the same crystal structure as quartz with a low temperature polytype isostructural with α-quartz and a high temperature polytype isostructural with β-quartz.

The 3T polytype has a positive index of refraction whereas the 2H polytype can possess crystals with either a positive or a negative index of refraction.

The layers of the structure may stack in different ways, to produce a 3-layer rhombohedral structure (3R Polytype), or a 2-layer hexagonal structure (2H polytype) which was formerly known under the name manasseite.

Starting with a polytype , the specialization could either replace the body by another qualified variable, actually a rename or by some type constant (including the function type) which may or may not have parameters filled either with monotypes or qualified type variables.

This uses the prefix LDH, and characterises components by the numbers of the octahedral cation species in the chemical formula, the interlayer anion, and the Ramsdell polytype symbol (number of layers in the repeat of the structure, and crystal system).