2.5" Andradite Garnet Cluster with Fluorapatite Crystals - China

This is a 2.5" wide cluster of, black, black andradite garnets (Melanite) (Melanite) that formed in association with light-green fluorapatite crystals, a combination of minerals that are seldom found together. It was collected from Chifeng City in Inner Mongolia, China.

Andradite is a species of the garnet group, and although not as well known as some other types of garnets such as almandine or pyrope, it is the most lustrous. There are three varieties of andradite which include melanite (black garnets), topazolite (yellow garnets) and demantoid (green garnets). It occurs in skarns developed in contact metamorphosed impure limestones or calcic igneous rocks; in chlorite schists, serpentinites and in alkalic igneous rocks (typically titaniferous).

Garnets are nesosilicates having the general formula X3Y2(SiO4)3. There are many species of garnet which include pyrope, almandine, spessartine, uvarovite, andradite and grossular (varieties of which are hessonite, cinnamon-stone and tsavorite). Garnets are found in a wide variety of colors including red, orange, yellow, green, purple, brown, blue, black, pink, and colorless, with reddish shades being the most common.

Fluorapatite is the most common variety in the apatite group. It's known to form early in almost all igneous rock as small, microscopic crystals. It can display a wide variety of colors and can be confused with beryl, phenakite and milarite. Often forming bright, lustrous crystals with hexagonal faces and off-center terminations. They are found in vugs, often associated with quartz and calcite. Most complete crystals are around an inch in length, though larger crystals up to about 4 inches long have been found.


DETAILS
SPECIES
Andradite var Melanite & Fluorapatite
LOCATION
Hexigten Banner, Chifeng City, Inner Mongolia, China
SIZE
2.5 x 1.9"
CATEGORY
SUB CATEGORY
ITEM
#182828