You just endlessly pick things out of context to foster your crazy conspiracy theory that the government is covering up the fact that there was some kind of supersophisticated coating on the anthrax spores mailed in the attack of 2001.
The article you cite is from November 1, 2001, and was written by Gary Matsumoto after his and ABC's claim that there was bentonite in the Daschle anthrax was shown to be totally FALSE. At that time, they only knew that the elements silicon and oxygen were present in the Daschle spores. People were just assuming that that meant that silica was present.
Later in the Matsumoto/ABC article it says,
... Parker's description of what he saw when he looked at the Daschle sample. "I have looked at the specimen under the microscope, both the electron microscope and the scanning microscope, and I can say that the sample was pure spores," he said. Parker also said the spores were "uniform in size," and "highly concentrated."
Whether you like it or not the OFFICIAL Whitehouse position is that silica was found as an additive. Just read Ari Fleisher’s book. The Whitehouse has NEVER retracted that.
Your wild conspiracy theories are based on the ravings of a madman called Matthew Meselson who embarrisingly (for the FBI) persuaded an FBI scientist (Douglas Beecher) to insert an irrelevant paragraph into a peer reviewed article. Peer reviewed articles are only as good as the peers who review them. And we all know how truthful Meselson is. Or should I remind you of his track record once again?