No clear polypropylene
On this page11
Cross-tabulating color against material gives the actual answer
Of the 80 light-passing rows on this shelf, 54 are clear PET, 21 are clear glass and 3 are frosted glass. The remaining two are scattered.
And no row on this shelf is recorded as clear polypropylene
Not one of the 24 polypropylene containers here. The closest are the three recorded as natural, which is unpigmented polypropylene and translucent rather than clear.
Which is a material fact rather than a gap in the shelf
Polypropylene is a semi-crystalline polymer and it does not go optically clear the way PET does. A clear polypropylene jar is not a row this shelf is missing; it is a thing that is uncommon.
So a buyer who needs to see the contents is choosing PET or glass
Which collapses a three-material shelf into a two-material one for this group’s main requirement. The polypropylene rows are available for anything where visibility does not matter.
That is the kind of finding a single-field count hides
Counting materials gives 119 PET, 41 glass and 24 polypropylene, which reads as three options. Crossing material against color shows that one of the three cannot answer the question this group asks.
The glass side is also smaller than it looks for this purpose
Forty one glass rows, of which 21 are clear and 3 frosted. The other 17 are amber, blue or similar, so the glass available for seeing through is half the glass on the shelf.
And PET carries most of the clear end
Fifty four of the 76 clear rows. Which makes PET the default for this group and raises the one question PET brings with it, which is scratching.
A PET wall is softer than glass and harder than the stones in it
Tumbled stones and crystal points will mark a plastic wall over time, and a hazed wall removes the reason the jar was clear. The keys and security property reaches the same conclusion about steel parts.
Which gives glass an argument it does not have on most shelves
Twenty one clear glass rows that stay clear, against 54 clear PET rows that are lighter and do not break. The pages name the trade rather than resolving it.
And nothing here states a hardness, a scratch resistance or a haze figure
The record carries a material name and a color name. Those two fields are what the finding is built on, and no page converts either into a performance claim.