- sub-total ₹0/-
- Discount Applied ₹ 0/-
- total ₹0 /-
- Payable Amount ₹0 /-
All gemstones can be classified as either:
Gemstones can also be:
a term used to describe a crystalline substance that does not have a naturally-occurring characteristic shape. (i.e Rose Quartz)
This type of material has grown not as a single crystal but as an aggregate of small or microscopic crystals randomly orientated within the body of the gem. These gems are usually semi-translucent or opaque and slightly porous. Although all crypto-crystalline gems are massive, it should be noted that not all massive materials are crypto-crystalline. (i.e Chalcedony Quartz)
the characteristic crystal form displayed by a mineral.
Crystallography is defined as the study of crystals and their structure.
There are 3 elements of symmetry that are fundamental to the study of crystallography.
Symmetry: correspondence, similarity in or between the opposing sides of an object, considered as halves on either side of a central line, in form and dimensions.
Axis of Symmetry: an imaginary line passing through a crystal that will permit a characteristic representation of a crystal 2, 3, 4 or 6 times during each 360 degree rotation.
Plane of Symmetry: this is a plane through a crystal which divides the crystal into two mirror-image halves.
Centre of Symmetry: a crystal possesses a centre of symmetry when identical faces and edges occur on exactly opposite sides of a central point.
All crystals can be classified into seven crystal systems:
These seven crystal systems are classified in terms of:
|Cubic System :||
The most symmetrical of all the crystal systems, it possesses:
Acicular: Slender needle-like crystals.
Botryoidal: Resembling a bunch of grapes (e.g Malachite).
Crystal Face: One of a number of flat surfaces bounding a crystal.
Form: This is a group of similar crystal faces.
Lamellar: When a mineral is composed of thin layers or plates, like the leaves of a book.
Pinacoid: This is a pair of crystal faces which are parallel to two crystal axes and cut by the third.
Basal Pinacoid: Parallel to the lateral axes.
Prism: A crystal form whose faces are parallel to the principle axis and cut by the lateral axes.
First-order: Each prism is cut by two lateral axes.
Second-order: Each face is cut by only a single lateral axis.
Striations: Growth lines on a crystal face.