Kho,
If your Lapis is the same stuff we have here, mined by RMC Lonestar near Monterey CA, It can provide a lot of Ca (and Mg?) when you drive the pH low.
It is an attractive mix of colors with a tan average, but lots of flecks of brown, black and white that make it very pretty. The white chips are actually pieces of sea shell or fossil limestone/dolomite. Passivated by long exposure to river fresh water, they can still slowly dissolve at pH much below 7, raising both GH and KH over time.
I love the stuff, but would measure GH and KH every few months if you are not doing water changes regularly.
Gravel is expensive to ship, so you may be getting a totally different gravel under the same Lapis name. IDK.
Wright
01 760 872-3995
805 Valley West Circle
Bishop, CA 93514 USA
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