Laurentthomasite, Mg&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;K(Be&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;Al)Si&amp;lt;sub&amp;gt;12&amp;lt;/sub&amp;gt;O&amp;lt;sub&amp;gt;30&amp;lt;/sub&amp;gt;: a new milarite-group-type member from the Ihorombe region, Fianarantsoa Province, Madagascar
European journal of mineralogy