The shards are just that...broken pieces of what were probably (un)holy vessels used during ceremonies. They were almost certainly destroyed by the army that assaulted the Temple nearly a decade ago. Although they lacked the power to destroy the Temple proper, you remember being told that they sacked the place.
To the west, the pillars are of sandstone, resting upon a red slate floor. Bits of broken pottery and sharp pieces of rock cover the floor here. The stumpe of a granite monolith, and the chunks of brownish-red rock around its base, indicate the the altar here was violently assaulted and destroyed. A few links of bronze chain, a twisted manacle, and a bronzewood maul with a snapped haft add to the impression that the enemies of the Temple who did this must have found this altar very hateful indeed.
To the east, the thick stone columns are deep green, with blood-red striations. The paving blocks are a mossy-green, with a circular dias-like area about twenty feet in diameter in the center part of the wing. The dias is two tiered, each rising about eighteen inches. The lower disc is greenish black stone, the upper is blackish green. The center of the altar is a depression about eight feet across, filled with scummy black liquid. Smashed shells are scattered all about, and a broken bronze knife lies close at hand.