What is <point group> of <quartz> ?
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WHICH IS THE POINT GROUP PG QUARTZ
SELECT DISTINCT ?b WHERE { resource:quartz property:point_group ?b }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q43010> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P589> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?answer. }
select distinct ?answer where { wd:Q43010 wdt:P589 ?answer}
trigonal-trapezoidal