“Mineral Universe” in a Crystal Ball

The rich “connotation” of crystal

  Abundant types of inclusion crystals can be divided into three categories according to different physical states: solid inclusions, liquid inclusions and gaseous inclusions. According to the relative relationship between the formation time of the inclusions and the crystallization time of the main crystal, it can be divided into: primary inclusions formed before crystal crystallization, concomitant inclusions formed at the same time as crystal crystals, and secondary inclusions that appear after crystal formation 3 types of body.

Inclusion crystal ball of hematite-impregnated fissures, which are typical secondary inclusions, 25.2 mm in diameter

Oxide inclusion crystal ball of dendritic manganese, 25 mm in diameter
Crystal “Medal”

  The golden rutile and gray-black hematite crystals are completely wrapped by colorless and transparent crystals. The fibrous rutile is oriented due to the influence of the hematite crystal structure, and the smooth and shiny plate-like hematite crystals are located in the center of the rutile intersection, and the two together form a star-shaped “medal”. The crystallization order of rutile and hematite precedes the crystal, and is then wrapped by the crystal, which are solid primary inclusions.

Rutile hematite inclusion crystal ball, diameter 28.8 mm

Oil biphasic inclusion crystal ball, diameter 31.5 mm
Crystal “Little Goldfish”

  The gas-liquid two-phase inclusions, which are composed of liquid and gas, are the most classic type of contemporaneous inclusions. They are encapsulated inside the crystal when the main body of the crystal is crystallized and formed at the same time as the crystal. The picture above is a crystal ball wrapped with orange-red gas-liquid two-phase inclusions. The orange-red oil gallbladder is like a small goldfish swimming in the crystal, surrounded by clusters of chlorite and fibrous rutile. By studying the temperature and pressure of the mutual transformation of gas-liquid two-phase substances in gas-liquid inclusions, the temperature and pressure conditions of the crystal crystallization environment can be inferred, which is of great significance for the study of mineral crystallization process and crystallization environment.
Crystal “feather”

  This ethereal and dreamy-looking blue inclusion is shaped like a floating feather and is praised as the “angel’s feather”. In fact, these blue “feathers” are not solid, but are formed by tiny structural defects in the crystal structure that cause Rayleigh scattering (optical phenomenon, a type of light scattering that occurs under certain conditions) of incident light Optical effect.

The blue needle crystal with dense inclusions is illuminated with bright white light. After the light passes through, most of the blue light is scattered, and yellow light spots formed due to the lack of blue light waves will appear.
Crystal “Ghost”

  Chlorite inclusion crystals are also known as “green ghost crystals”, so named because of the small scale-like chlorite group minerals contained in them. Chlorite as inclusions actually includes several varieties of chlorite minerals, the most common of which are oblique chlorite and oolitic chlorite. They are a series of silicate minerals that share the same layered structure and are similar in appearance, and specific mineral species can only be accurately distinguished by rigorous analytical testing.
  In chlorite inclusion crystals, thanks to the layered dispersion of scaly chlorite, the staged growth of crystals can be observed more intuitively. When the crystal grows to a certain stage, a layer of scattered chlorite appears on the surface, and then the crystal continues to grow. The chlorite originally on the surface is gradually wrapped by the crystal that grows later, and becomes the inner primary inclusion. The distribution pattern of this layer of chlorite inclusions still maintains the crystalline appearance of crystal crystals, forming a green “phantom”. This phenomenon also reflects the crystallization process of crystal crystals growing layer by layer from small to large.

Goethite water bladder inclusion crystal ball, diameter 25.5 mm. This kind of crystal with multi-phase, multi-type and multi-stage inclusions often witnesses more complex changes in the crystallization environment

“Blue needle” inclusion crystal ball formed by defects in crystal structure, 25.8 mm in diameter

Chlorite inclusion crystal ball, diameter 31.5 mm

  There are many types of inclusion crystals, too many to list. The process of encountering various inclusion crystals can not only deepen our understanding of crystallography and mineralogy, but also allow us to appreciate the beauty of mineral crystallization in the changing geological environment.