The kids will be so excited. These marbles all have something to do with each unit we covered this year. Plus we use marbles for the calendar. The marble jar is brimming! Thanks for the outstanding customer service.
Size is as-packaged, or the diameter of loose marbles. ("D" is the diameter of round items other than marbles.)
This is a mineral sphere suitable for playing and collecting. This is hematite, the mineral form of Iron Oxide, and it is very dense, although not as dense as a
man-made steelie. It is opaque and exhibits a brilliant black metallic luster. It is harder than pure iron and is especially devastating in the marble ring
where is is not unusual for the target marble to crack under pressure! These choice examples came out of Brazil.
What is amazing about hematite is that in its natural rough state, it looks like an ordinary black rock, but polishing brings out its metallic lustre, as in these marbles. It is like a steelie, without the extra heft.
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