Property talk:P537

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twinning
type of twins a crystal forms

Description	Describes the usual way that crystals show twinning.
Represents	crystal twinning (Q109856)
Data type	Item
Template parameter	de:Vorlage:Infobox_Mineral
Domain	According to this template: Minerals, Variants of minerals According to statements in the property: mineral (Q7946), mineral species (Q12089225) or mineral variety (Q429795) When possible, data should only be stored as statements
Allowed values	Some are specific for certain minerals: Bavenoer, Karlsbader, Manebacher, Periklin, Dauphinée, .... (note: this should be moved to the property statements)
Example	According to this template: orthoklase = Bavenoer, Karlsbader, Manebacher (Qualifiers for frequency?) According to statements in the property: pyrite (Q50769) → penetration twin (Q13366330) sunstone (Q2729026) → polysynthetic twinning (Q1238520) When possible, data should only be stored as statements
Source	mindat-, rruff-, mineral databases (note: this information should be moved to a property statement; use property source website for the property (P1896))
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties By value of property Most statements Fewest statements Most sitelinks Most linked wikis Total of sitelinks on items Most identifiers Fewest identifiers Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Database reports/Constraint violations/P537 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 14 Main statement 11 78.6% of uses Qualifier 2 14.3% of uses Reference 1 7.1% of uses
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Type “mineral (Q7946), mineral species (Q12089225), mineral variety (Q429795)”: item must contain property “instance of (P31), subclass of (P279)” with classes “mineral (Q7946), mineral species (Q12089225), mineral variety (Q429795)” or their subclasses (defined using subclass of (P279)). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P537#Type Q7946, Q12089225, Q429795, SPARQL

Value type “crystal twinning (Q109856)”: This property should use items as value that contain property “instance of (P31), subclass of (P279)”. On these, the value for instance of (P31), subclass of (P279) should be an item that uses subclass of (P279) with value crystal twinning (Q109856) (or a subclass thereof). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P537#Value type Q109856, SPARQL

This property is being used by: ca:Plantilla:Infotaula de mineral ga:Teimpléad:WD Bosca Sonraí Mianra Please notify projects that use this property before big changes (renaming, deletion, merge with another property, etc.)