According to the researchers, when the amount of diopside
added to the base of hydroxyapatite increases up to 30 weight percent, the size of final composite grain and its size distribution significantly decreases after two steps of sintering process.
Castellanos and co-workers (personal communication) described in detail the characteristic mineral assemblages from reaction zones recognized in marbles, which include calcite + graphite [+ or -] quartz; calcite + diopside
[+ or -] tremolite [+ or -] epidote-group minerals [+ or -] muscovite; calcite + wollastonite + quartz + garnet + diopside
; calcite + dolomite + Ti-clinohumite + diopside
+ forsterite + clinochlore [+ or -] graphite; calcite + forsterite + tremolite; dolomite + calcite + clinochlore.
UBAIDULLAH QADRI: Pakistan has enormous wealth of expensive gems such as ruby, emerald, tourmaline, garnet, topaz, peridot, aquamarine, spinel, pargasite, diopside
, moonstone, pink topaz, sapphire, zircon, feldspar, agate, serpentine jade, epidote, pink beryl (morganite), purple beryl, sphene, zoisite, lapis lazuli, turquoise, and kunzite etc.
and/or calcic hornblende, magnetite and minor quartz (less than 5%).
As an East Coast native I was drawn to the case which contained a 5-cm golden beryl (heliodor) from the extinct Slocum Quarry, East Hampton, Middlesex County, Connecticut: a 4 X 8-cm transparent green and pink elbaite from Newry, Maine; and a 4-cm grossular on diopside
with grossular crystals to 1.
The MPH sample was dominated by diopside
and hornblende; RSB by epidote, garnet, and biotite; and SQB by rutile, epidote, staurolite, and apatite.
The reactions explaining the sequence in which talc, tremolite, diopside
and forsterite appear in typical contact metamorphic environments, (Fig.
A few, glinting blue-white diamonds' translucent aquamarine the colour of a Caribbean sea' rainbow opals' vibrantly green Russian diopside
, a match for the finest emeralds' and, my all-time favourite, five perfectly matched, perfectly cut fiery garnets, red as the blood I feel I have on my hands.
Kimberlite is a host rock to diamonds, but not a source rock: Kimberlite indicator minerals consist of pyrope and eclogitic garnets, magnesian ilmenite, chromite, chorine diopside
, forsteritic olivine and diamond and the presence of these minerals is used to determine the proximity of diamond-bearing kimberlites.
China University of Geoscience researchers discovered microscopic grains of diopside
, ilmenite, chromite and garnet in both fossil gravels and modern river sediments.
For instance, trace amounts of limonite impart a yellowish brown color; serpentine, hornblende, and diopside
produce varying tones of green; minute quantities of hematite, vesuvianite, and garnet introduce a reddish brown hue; sphene, epidote, and chondrodite give a yellow tinge; and plant and animal remains produce shades of dark gray to almost black.
Kimberlite indicator minerals, including pyrope garnet, chromite, picro-ilmenite, chrome diopside
, and olivine were recovered from 356 samples.