Tianhuang Yuxi

Stone shape

? Tian Huang's mother stone is mountain material, angular. After being carried and abraded by gravity and water flow, its edges and corners gradually become rounded, forming pebbles (boulders) of various shapes and sizes, which are subangular or sub-circular. It is doubtful whether the "Tian Huang" we found is angular or round and smooth. It may be ground by digging stones or mountain materials, but if the prototype is destroyed during processing, it is difficult to identify it. Tian Huang is usually tens to hundreds of grams, and it is very rare to exceed kilograms. A few kilograms of Tian Huang should be vigilant.

2. Stone skin

Tian Huang has been buried in paddy fields for a long time. After weathering, its appearance usually forms a cortex with different characteristics. According to the thickness of cortex, it can be divided into thick skin (>; 1mm), thin skin (

3. Radish silk pattern

Observing the inside of Tianhuang with transmitted light, it generally develops into a "radish silk pattern" texture, which is a very important distinguishing feature. There are many kinds of "shredded radish" in Tianhuang, with different degrees of development, which can be divided into strips, stripes and filaments according to their thickness. According to the shape, it can be divided into linear, reticulate and irregular shapes; It can be divided into white, yellow and brown according to color; According to transparency, it can be divided into translucent and slightly transparent. Tian Huang basically has "shredded radish", and the saying that "no grain can't make a field" is correct, but it can't be absolute.

4. Red squares (or red ribs)

Tian Huang's "lattice" or "tendon" is actually a kind of crack. Under the surface conditions, especially in paddy fields, these cracks are generally infiltrated and precipitated by Fe2O3 solution and dyed yellow-red, so they are called red squares or red ribs. But there are also a few colorless white cracks, called colorless cells. It is common for Tian Huang to have red squares (or red ribs), and there is also the saying that "no square can't make a field".