AGATE, a banded variety of Chalcedony
- VARIETY OF: Crypto-crystalline
- USES: Gemstone and ornamental stone.
- COLOR: Nearly any color, even colorless. The key is the presence of banding
- HARDNESS: 7
- CLEAVAGE: none
- CRYSTAL SYSTEM: none visible (actual crystals are microscopic)
- For natural Agate mineral specimens see our For Sale or Sold lists
Agate is the term for banded
chalcedony. It is
often found as the layers lining geodes deposited in different colors as a
quartz geode formed contained different impurities (or even none, resulting
in a white or colorless band).
As a general term, agate is so broadly descriptive that there are
hundreds of names applied to varieties of agate from different localities.
While many names reflect the source, some popular varieties are descriptive,
such as "blue lace agate".
Note that in come cases, the term "agate" is used where the term "jasper"
may be more accurate, as in "moss agate" in which a white quartz contains a
fractal pattern of green and black, resembling tiny blades of moss.
Agate is primarily formed by the deposit of silica from solution; it is
also a common method of fossilization, as the organic remains of some living
thing are gradually replaced by quartz. "Agatized coral" from the Tampa Bay
area is an excellent example, as are all of the specimens of petrified wood.
Agate is only one of several
chalcedony (cryptocrystalline quartz) varieties.
The primary varieties are as follows:
- Agate is a banded variety
(sometimes with translucent bands)
- Bloodstone is
green with red speckles
- Carnelian is yellow
- Chrysoprase is
- Flint is generally black
with a fibrous microscopic structure
- Jasper is any colorful
- Onyx is black, white, or
alternating black and white
- Sard is yellow to brown
- Sardonyx is banded,
alternating sard and (usually white) onyx