Necef stone (rock crystal)
2 usagesShort answer
Transparent rock crystal of the quartz family, known as “necef” as a bead material. The same word is also applied in the trade to colourless glass and synthetic stones, so the name alone does not establish the material.
Is this the piece you have?
Photograph it and open a pre-assessment request
Tests you can do at home: Transmitted light · Hydrostatic specific gravity · Simichrome test (may leave a mark on the surface; try it only on a hidden spot)
Meanings in the trade
These are the recorded usages of the term: publications, catalogues and the market. Each usage carries its own source grade and is not a definition.
- Evidence grade A — publication. The grade states the type of the source, not the truth of the claim.BookQuartz family
Malzeme maddesi 'Necef' (s.35): kuvars grubu kaya billuru, şeffaf; katalog 14a (s.78).
- Evidence grade C — institutional seller. The grade states the type of the source, not the truth of the claim.Dealer siteQuartz family
Ufuk Kucur Eseri Necef Maskot Tesbih
Canonical mapping
A mapping is not a conclusion: it is a claim about what the term points to, not a measurement of the material.
Necef stone (rock crystal)Quartz family
How to tell — and what it does not tell
This text has so far been written only in Turkish; the text you see is in Turkish.
How to tell
Specific gravity Kuvarsın özgül ağırlığı: GIA gül kuvars ve sitrin için 2,66 (+0,03/−0,02), yani 2,64–2,69 verir; Handbook of Mineralogy ölçülmüş değeri 2,65, masif (kriptokristalin) kuvars için 2,59–2,63 olarak verir. Kaya kristali (necef) bu aralıktadır ve doygun tuzlu sudan çok daha yoğundur: tuzlu suda yüzen bir tane kuvars olamaz.
- Evidence grade A — publication. The grade states the type of the source, not the truth of the claim.Rose QuartzGIA2026
Specific gravity: 2.66 (+0.03/-0.02)
Accessed on:
- Evidence grade A — publication. The grade states the type of the source, not the truth of the claim.CitrineGIA2026
Specific gravity: 2.66 (+0.03/-0.02)
Accessed on:
- Evidence grade A — publication. The grade states the type of the source, not the truth of the claim.QuartzAnthony et al. (MSA)2001
D(meas.) = 2.65; 2.59-2.63 when massive. D(calc.) = 2.66
Accessed on:
- Evidence grade A — publication. The grade states the type of the source, not the truth of the claim.Gems: Their Sources, Descriptions and Identification, 6th ed.O'Donoghue, M. (ed.)2006
1.544-1.553 0.009 Positive U 7 2.65 Quartz
Accessed on:
Sources
A grade states the strength of the source, not of the conclusion.
Recorded usages: 2Evidence grade A — publication. The grade states the type of the source, not the truth of the claim.Evidence grade C — institutional seller. The grade states the type of the source, not the truth of the claim.
- Evidence grade A — publication. The grade states the type of the source, not the truth of the claim.Sabırla Selamete Tane Tane… Osmanlı Kültüründe Tesbih ve Hüsnü Dikeçligil Tesbih KoleksiyonuTekin, Kemal Hakan2014ISBN 978-605-65152-0-0 s.35
Accessed on:
- Evidence grade A — publication. The grade states the type of the source, not the truth of the claim.Sabırla Selamete Tane Tane… Osmanlı Kültüründe Tesbih ve Hüsnü Dikeçligil Tesbih KoleksiyonuTekin, Kemal Hakan2014ISBN 978-605-65152-0-0 s.78
Accessed on:
- Evidence grade A — publication. The grade states the type of the source, not the truth of the claim.Rose QuartzGIA2026
Specific gravity: 2.66 (+0.03/-0.02)
Accessed on:
- Evidence grade A — publication. The grade states the type of the source, not the truth of the claim.CitrineGIA2026
Specific gravity: 2.66 (+0.03/-0.02)
Accessed on:
- Evidence grade A — publication. The grade states the type of the source, not the truth of the claim.QuartzAnthony et al. (MSA)2001
D(meas.) = 2.65; 2.59-2.63 when massive. D(calc.) = 2.66
Accessed on:
- Evidence grade A — publication. The grade states the type of the source, not the truth of the claim.Gems: Their Sources, Descriptions and Identification, 6th ed.O'Donoghue, M. (ed.)2006
1.544-1.553 0.009 Positive U 7 2.65 Quartz
Accessed on: