answersLogoWhite

0

Opal is a mineraloid that lacks a definitive crystalline structure, which means it does not have a traditional grain size like crystalline minerals. Instead, opal is composed of silica spheres, typically ranging from 150 to 300 nanometers in diameter. The arrangement of these spheres can create a play-of-color effect, but since opal is not crystalline, it is more accurate to describe its structure in terms of the size of these silica spheres rather than grain size.

User Avatar

AnswerBot

1mo ago

What else can I help you with?

Related Questions

What is a opals grain size?

Opal's grain size refers to the size of the silica spheres that make up the gemstone. Larger grain sizes can enhance the play of colors in opals, while smaller grain sizes may result in a more uniform color appearance. Grains in opal are typically between 150 and 300 nanometers in size.


What is a small grain size rock?

clay


What sedimetary rock has the smallest grain size?

Shale is a sedimentary rock that typically has the smallest grain size due to its fine-grained and compacted nature.


What is grain according to geologists?

Grain refers to particle or crystal size in rock.


What are 3 characteristics of a rock?

1.Grain Size 2.Grain Shape 3.Grain Pattern


Which features tells you how large the grains of a sedimentary rock are?

The size of the grains in a sedimentary rock can be determined by examining the texture of the rock. Coarser grains indicate a larger grain size, while finer grains indicate a smaller grain size. Other features that can provide clues to grain size include the sorting (uniformity of grain sizes) and rounding of the grains.


What else does rock texture include besides grain size and arrangement?

Grain shape.


What rock has the finest grain size?

The rock with the finest grain size is typically shale. Shale is a sedimentary rock composed of clay particles that are less than 1/256 millimeter in diameter, giving it a very fine texture. This fine grain size allows shale to split easily into thin layers, which is a characteristic feature of the rock.


How does texture affect grain size in rock?

It doesn't. The grain size effects the texture. If a rock has a small grain size, it will have a smooth texture. If the grain size is large, such as pebbles, the texture will be rough. For example, siltstone is one of the smoothest rocks because it contains silt particles, which are .0004cm to .006cm. Conglomerate though contains various particles including cobbles and boulders, which are from 10cm to 100cm.


Wind mostly erodes pieces of rock that are what size?

the size of a sand grain or smaller


What are the grains of rock?

Grains: Grains that are not crystals in rock do not have flat shiny faces. They are rounded, like grain of sand, or jagged, like a piece of broken rock. Grain Size: Grain size in rocks can mean the size of crystal grains or of fragments: Coarse Grained: most of the rock is made of grains as largeas rice, or larger.


What are the size shape and positions of the grain that makes up a rock?

These characteristics determine a rock's texture.