Multiple choice Which of the following sets represents orthosilicates only? Thortveitite, Phenacite, Willemite Benitoite, Beryl, Phenacite Willemite, Zircone, Kaolinite Phenacite, Willemite, Zircone Beryl, Thortveitite, Kaolinite Reveal answer Fill a bubble to check yourself D Correct answer Explanation Phenacite - Be2SiO4 : Orthosilicate Willemite - Zn2SiO4 : Orthosilicate Zircone - ZrSiO4 : Orthosilicate