http://en.wikipedia.org/wiki/Quartz-porphyry
Looks like its this stuff
http://olympusspa.net/health.aspx
DEFINITION: The Mineral Adamantine Stone is categorized as QUARTZ PORPHYRY among igneous rocks. It is a concentrated form of combined FELDSPAR and QUARTZ through a natural crystallization process.
PROPERTIES:
* It was discovered in China, about 3,000 years ago as a mysteriously miraculous crystal that was used as an important ingredient in Eastern Medicine. It is especially effective for enhancing metabolism and for its curing capabilities.
* In the past, the mineral stones were found in deep canyon valleys of Korea, China and Japan, and were used for various medicinal purposes. However, today, due to heavy metal pollutants in the environment, the stones' effectiveness has decreased.
* The Mineral Adamantine Stone of No Hwa Do (???) in Jun Nam (??) Korea is mined 350m below ground of No Hwa Do mine (100m below water) free from chemical pollutants.
5 FUNCTIONS OF THE MINERAL ADAMANTINE STONE:
* Powerful Absorption: Even a 325 Mesh (about 0.043mm) size particle of the Mineral Stone has microscopic holes which creates a capillary-like phenomenon that absorbs contaminated chemicals in the atmosphere by dissolving them.
* Water Purification: It purifies water by modulating the PH level. It also limits strong acidity and alkali levels to obtain the best quality of water that is most suitable for the human body.
* Oxygen Production: It increases the oxygen level by limiting the bacteria and heavy metallic chemicals in the water.
* Mineral Development: The Mineral Stone consists of about 40 different types of minerals which are beneficial for human body. It develops such minerals and enhances the metabolism. (The most recent study shows that there are total of 25,000 different components in the Mineral Stone)
* BIO Radiation: As an emanate stone with the wavelength of 4-14, it helps to maintain the most suitable condition of human body.