subvitreous

subvitreous

(sʌbˈvɪtrɪəs)
adj
(usually of the appearance of minerals) almost but not quite vitreous; somewhat vitreous
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
Unfortunately, the luster was subvitreous to dull, so I didn't see enough commercial potential in them to revisit the locality after I became a mineral dealer 20 years later.
Laumontite is milky white and subvitreous to vitreous.
Physical, chemical and crystallographic properties: Luster: subvitreous. Diaphaneity: transparent to translucent.
The luster varies from subvitreous on the bladed crystals to silky on the fibrous crystals.
These are hard, solid, smoothly subvitreous, very good pseudomorph specimens for around $150 for the best.
Physical properties: Luster: vitreous on cleavage plates, resinous on crystal faces and subvitreous on fracture surfaces.