( 154^ ) 
I have alfo obferVd that this fhiningSand weighed twice 
heavy as our common fcowring Sand. 
Mow when [took fome of the Pellucid or rranfparent 
Sand (v;bich did not (bine, becaufe it reflefted no light) 
J obferved that the fides and angles of each Grain were 
freer from fears and blemillies than mofl: others I had yet 
cpnGder*d, from whence I concluded, that fuch Sand had 
not lain long near the fuperficies of the Earth. 
I placed one of thefe Sands before a Microfcope, fo as 
the Painter might have a full view of three of the four 
Dblique fides^ee Fig 1 1. A B C D E F, one of the flat fides 
fceing reprefented by B C D another D E A G, which 
bad a ftreakor fcratchin it, fijppos'd to be done by the 
preflure of another Sand upon it 5 and the third flat fide 
is defcribed by B G a b. 
Having reprefented this tranfparent Sand in its fliorteft 
pofition, I put it in another fight, fo as you might fee it 
in its full length , as in Fig. 12. H I K L M, and therein 
ftreaks or little holes, which I firmly concluded to be oc- 
cafioned by the coUifion of other Sands. > 
I likewife took notice of fome, but very few. Sands that 
were long and flender, and which did not appear bigger 
^ hro a common Microfcope, than a fingle hair of onesBeard 
to the naked Eye. 
I have take n feveral of the (hining Sands and broke em 
to pieces, and then viewed the broken pieces thro a Mi» 
crofcope, and obferved, that many of thofe finail Parti- 
cles, tho they were a thoufand times lefs than a grain of 
common Sand, had a glance or luflre when the light fell 
upon them, and that feveral fuch particles, and fome that 
were larger, if youlookt upon them againft the light, re- 
prefented a fine blooming red 5 but fome of them were 
fo but in part, from whence I concluded, that part which 
was not red was thicker than the refl:, and did not ad- 
mit of light thro it. Among thefe fmall broken pieces of 
Sand, I obferved feme that had fix fidesj others that were 
tri- 
