Description
Fossil Coral Gemstone 6.92ct
Description
This Fossil Coral is natural gemstone which is a yellow color, it’s Originates from Indonesia and it’s exact weight is 6.92ct the measurements are 17.70×13.56×3.66mm. The shape and cut of this stone is Oval Cabochon It’s graded Opaque and clarity is Good. This 6.92ct Fossil Coral Gem is available for ready to ship anywhere in the world. You can also select Certification and shipment method as optional.
Details8.20ct
Summary No | AK13225 |
Species | Fossil Coral |
Weight | 6.92ct |
Shape/cut | Oval Cabochon |
Color | Yellow |
Dimension | 17.70×13.56×3.66mm |
Clarity | Good |
Transparency | Opaque |
Origin | Indonesia |
Treatment | None |
Fossil Coral Gemstone 6.92ct
Properties Of Fossil Coral
Chemical Composition: Sio2[silicon dioxide]
Hardness: 6.5-7.0
Specific Gravity (Density): 2.60 – 2.64
Refractive Index: 1.530 – 1.540
Fossil coral is a natural type of gemstone formed by ancient corals. Fossilized Coral is organisms that live in warm, shallow marine waters. They are often fossilized by infilling and replacement with quartz or calcite. These materials can be polished into attractive gems. Actually, the proper name for fossil coral is ‘agatized coral’ or ‘agatized fossil coral’, because, during formation, the coral remains are gradually replaced with agate, a variety of naturally occurring chalcedony, or microcrystalline quartz. It is created through the process of replacement, whereby calcium carbonate(CaCO3) (coral) is replaced by silica. This unique process of preservation can result in different mineral concentrations from specimen to specimen. It can be mistaken for other types of agate such as moss or dendritic agate, but the pattern and body color of fossil coral is quite distinct. Fossil coral is also much harder than precious coral. These, Fossil Coral specimens are found in either Indonesia or the United States (Florida and Georgia). But, Indonesian fossilized coral is considered to be the most desirable and unique. Actually, in Indonesia, entire coral heads are often found perfectly preserved, appearing exactly as they did 20 million years ago, though density may vary according to the exact chemical replacement of silica, manganese(Mn), iron(Fe) and other various types of minerals.