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Crystal Structure:
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Rastsvetaeva R K , Arakcheeva A V , Khomyakov A P , Doklady Chemistry , 351 (1996) p.294-297, Crystal structure and microtwinning of a new monoclinic analog of, nenadkevichite, Locality: Khibiny alkaline massif, Kola Peninsula, Russia
Pseudo Orthorhombic - Crystals show an orthorhombic shape.
Hardness:
5 - Apatite
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Lemmleinite-K
Gladstone-Dale:
CI meas= 0.004 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.025 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2501,KPDmeas= 0.2555,KC= 0.2566 Ncalc = 1.72 - 1.73