sphene

Sphene was the most commonly used name until the IMA decision, although both were well known.

Sphene persists as the informal name for titanite gemstones.

The stability of perovskite in igneous rocks is limited by its reaction relation with sphene.

Owing to the quenching effect of iron, sphene exhibits no fluorescence under ultraviolet light.

Other minor inclusions are sphene, apatite, rutile, zircon, and sphalerite.

The minerals found are quartz, mica, chlorite, albite, sphene, and graphite.

In volcanic rocks perovskite and sphene are not found together, the only exception being in an atindite from Cameroun.

Zircon, apatite, sphene, magnetite, ilmenite and sulfides occur as accessory minerals.

These rocks contain also iron oxides (usually titaniferous), apatite, sometimes sphene, augite, and olivine.

Distinctive accessory minerals include: fluorite, topaz, apatite, spinel, allanite, sphene and cassiterite.

Biotite and hornblende frequently enclose feldspar ophitically; less commonly iron oxides and sphene do so.

Of these the former consists of orthoclase, nepheline, sodalite, diopside and aegirine, biotite and sphene.

The white and the pink facies are a more fine-grained variation of the melanocratic facies, they also lack hornblende and sphene.

While xenotime may contain significant amounts of thorium or uranium, the mineral does not undergo metamictization like sphene or zircon would.

One series is essentially igneous (orthogneisses); usually they contain pale green pyroxene, a variable amount of feldspar, sphene, and iron oxides.

Uplift of the lesser Himalayas, Northern Pakistan, as inferred from fission-track ages of sphene, epidote, and zircon.

It is widely distributed and occurs primarily in the minerals anatase, brookite, ilmenite, perovskite, rutile and titanite (sphene).

Other minerals that can be used along the ZTR index are garnet, magnetite, sphene, and other minerals from local provenance sources.

Among other minerals found in them are biotite, chlorite, tourmaline, epidote, apatite, garnet, hornblende, augite, sphene and pyrites.

These include peridot, aquamarine, topaz, ruby, emerald, rare-earth minerals bastnaesite and xenotime, sphene, tourmaline, and many varieties and types of quartz.

A number of other minerals are also found in the region such as peridot, tourmaline, topaz, garnet, red spinal, pargasite, diopside, sphene, apatite, azurite, rose quartz, and agate.

The name sphene continues to be publishable in peer-reviewed scientific literature, e.g. a paper by Hayden et al. was published in early 2008 in the journal Contributions to Mineralogy and Petrology.

A banded and mottled calc-silicate hornfels occurring with the limestone at Derry Falls, west-northwest of Braemar, has yielded malacolite, wollastonite, brown idocrase, garnet, sphene and hornblende.

Apatite, sphene, zircon, micas and volcanic glass typically contain enough uranium to be useful in dating samples of relatively young age (Mesozoic and Cenozoic) and are the materials most useful for this technique.

Metamorphic rocks composed primarily of amphibole, albite, with subordinate epidote, zoisite, chlorite, quartz, sphene, and accessory leucoxene, ilmenite and magnetite which have a protolith of an igneous rock are known as 'Orthoamphibolites'.