Silica
Silicon dioxide,
Silicic anhydride,
Siliceous earth,
Colloidal Anhydrous Silica
Formula: O2Si
Molecular Weight: 60.0843
Cas No：112945-52-5; 60676-86-0; 7631-86-9
Absorbent; Abrasive; Opacifying agent; Anticaking agent; Bulking agent; Viscosity Controlling
[1] 張麗卿，『優質保養品選擇策略』，聯經出版社，2003/07/10。
日文：シリカ、無水ケイ酸、二酸化ケイ素，參見：http://www.ba-m-bi.com/seibun/gaiyo/silica.htm
Silica會致痘嗎？為何我用了bareminerals blemish remedy foundation 全面長石頭大痘，裏面含silica,有人跟我一樣嗎？
WHAT-IT-DOES: viscosity controlling, absorbent/mattifier
Details
A white powdery thing that's the major component of glass and sand. In cosmetics, it’s often in products that are supposed to keep your skin matte as it has great oil-absorbing abilities. It’s also used as a helper ingredient to thicken up products or suspend insoluble particles.