The main component of chalcedony is silica (SiO2), with Mohs hardness of 7 and specific gravity of 2.5~2.6. Because it contains chrysocolla, it is light blue, dark blue or blue with yellowish green, with elegant color and high transparency. It can be used to make rings, earrings and other ornaments, so it has the reputation of "sapphire in Taiwan Province Province" and is the most valuable gem produced in Taiwan Province Province.

2. Taiwan Province fish

Taiwan jade belongs to amphibole, also known as "amphibole jade". Because it is produced in Toyota Mine in Hualien County and has the best texture, it is commonly known as "Toyota jade". Because it is produced in Taiwan Province Province, its scientific name is "nephrite from Taiwan Province Province", and it is generally called "Taiwan Jade".

Taiwan jade is produced in contact metamorphic serpentine in the east, and its color is green, grass green, dark green, yellow-green or yellow-gray, translucent to opaque, with glass luster. Microscopically, it is composed of fine fibrous or fine plush tremolite with a small amount of chromite, garnet, chlorite and magnetite, forming black spots or stripes. The hardness is 6~6.5 and the specific gravity is 2.9~3. 1.

The jade in Taiwan is of great historical and cultural significance, because according to the research results of experts, 44 pieces of 144 pieces of ancient jade collected by museums in Southeast Asia from 3000 BC to 500 BC were identified, and it was confirmed that 1 16 pieces of ancient jade were Toyota jade in Taiwan Province Province. 』

3. Cat's Eye Jade in Taiwan Province Province

First of all, it must be emphasized that this is not opal (opal refers to all kinds of emeralds with cat's eye effect in the jewelry industry, with a hardness of 8.5. The real opal is very expensive and the output is very small. ) Opal is not produced in Taiwan Province Province.

Cat's eye jade in Taiwan Province Province refers to a kind of jade with cat's eye phenomenon in Taiwan jade (jade in Taiwan Province Province can be divided into ordinary jade, cat's eye jade and wax jade), which is very rare and precious. Cat's eye jade in Taiwan Province Province has glass luster and is long fiber. Each fiber is at least 2 cm under polarizing microscope, and even 100cm long in field observation. Its hardness is as high as 7. 1, which is higher than ordinary jadeite. Its essence is the cat's eye jade of jadeite, which is only produced in Taiwan Province Province.

4. Penghu aragonite-reprinted from "Shijie aragonite Exhibition Hall"

The geology of Penghu is dominated by volcanic lava-basalt, and some weathered soil or sedimentary rocks are mixed in the geological structure. The sedimentary rocks are rich in calcium carbonate and carbonate minerals, which is one of the most important minerals to form aragonite in Penghu.

The formation of aragonite in Penghu has different changes due to different geological conditions. Most aragonite containing iron oxide is red or brown. However, those containing more iron carbonate will be exhausted; Chlorite is rich in green; If calcium carbonate is the main component, it is white to light yellow; Those containing silica are in the form of jade crystals. This is why Penghu aragonite has colored lines and various concentric circles.

Basically, Penghu aragonite is a semi-precious stone, suitable for carving into works of art, and is a world-renowned natural mineral.