Item: 10 DCs of Quartz Starting Bid: 100k Minimum Bid Increment: 25k Auction Ending Time: 48 hours after last valid bid
So the nether quartz flakes then? Quartz has 3 varieties and you need to be more specific before a lot of users with that kind of money will commit to an auction.
Quartz "pieces" or "flakes" are just called "nether quartz" - any other variants have specific names. For example, quartz blocks specifically have the name "blocks" added to the end of it, and quartz ore has "ore" at the end, etc for other variants. But for clarification for those players who are confused by this, could the auction host confirm that these are indeed uncrafted pieces of quartz (sometimes referred to as "pieces" or "flakes")?
Since you have received at least one valid bid you can't close the auction. If you are unable to complete the auction you could be facing being banned from the auction forums.