Ilmenite-group titanates are relatively common accessory minerals in agpaitic nepheline syenite (lujavrite) in the Pilansberg alkaline complex, South Africa. They crystallized in three generations and form a continuous ecandrewsite – pyrophanite solidsolution extending from (Zn0.81Mn0.12Fe0.07)TiO3 to (Mn0.93Fe0.7)TiO3. The earliest generation of ferroan manganoan ecandrewsite of widely varying...

Th-rich (up to 18.4 wt.% ThO2) loparite occurs as an accessory phase in foyaite pegmatites at Mr. Eveslogchorr, Khibina complex, Russia. It is associated with aegirine, astrophyllite, eudialyte, lorenzenite, lamprophyllite, magnesio-arfvedsonite and gerasimovskite. Loparite crystals are zoned from niobian loparite (core) to niobian thorian and thorian niobian loparite (rim). Th-enrichment is ac...

We present in situ major element, trace and Sr–Nd isotope data of apatite from an alkaline–carbonatite intrusion the South Qinling Belt (SQB) to investigate their magma evolution mantle sources. The Shaxiongdong (SXD) complex consists predominantly early Paleozoic hornblendite, nepheline syenite, subordinate Triassic carbonatite. Apatites all lithologies are euhedral subhedral belong fluorapati...

Abstract. A second occurrence of bobtraillite is described from the Gejiu nepheline syenite, southwestern China. The extremely rare and complex boron-bearing zirconium silicate associated with albite, orthoclase, jadeite, fluorite, andradite, titanite, as well other REE zirconium-bearing minerals, catapleiite, moxuanxueite, låvenite, eudialyte, britholite-(Ce), calcioancylite-(La). EMP LA-ICP-M...

Abstract The influence of inorganic minerals (colemanite and nepheline syenite) as additives for sustainable clay brick manufacture has been examined. Each additive was added at 4 wt% to 96 samples were fired 950 °C 1040 then compared with 100% clay. Multiple analytical techniques (X-ray fluorescence, dilatometry, boiling water absorption, volumetric shrinkage, mercury porosimetry) used analysi...