FIARRINGTON ] DESCRIPTION OF THE ARTIFACTS 93 
known as impure quartz and the source of supply has not been 
determined. Most of them have a pretty hexagonal cleavage at one 
end, which was, of course, the end displayed by the Indians. 
Quartz crystal. 29.5 mm. long, 15 mm. wide, 12 mm. thick. Six well-formed 
faces at one end. Not glass clear. (Pl. 16, c.) 
Small quartz crystal with somewhat marred cleavage. 15 mm. diameter. 
(PI. 16, 0.) 
Irregular shaped crystal of quartz. Pretty and very clear. Cleavage lop 
sided. 26 mm. long, 23.5 mm. diameter. (Pl. 16, d.) 
Quartz crystal with curious minute fractures throughout. The tip end has 
symmetrical cleavage, the butt is nicely shaped. 27 mm. long, 17.5 mm. 
diameter. 
Beautiful but minute quartz crystal with very symmetrical cleavages at one 
end. The quartz at the other end is more coludy. 14.25 mm. long, 8 mm. 
diameter. 
Quartz crystal, clear as diamond, having well-formed faces at one,end. 21 
mm. long, 13 mm. wide, 9.5 mm. thick. 
Irregular fragment of quartz crystal, with broken hexagonal cleavages at 
one end. 63 mm. long, 31 mm. wide, 15 mm, thick. 
TRONSTONE CONCRETION CUPS 
The shells of ironstone concretion had a wide use among the south- 
ern California Indians as cups and for like purposes. -The concre- 
tions are usually of a brownish color and resemble a hollow sphere 
filled with sand. Concretions or fragments of concretions worn to 
shape by rubbing on a gritty stone make neat little cups. The size 
varies greatly, the largest listed below measuring 80.5 mm. in 
diameter. 
Fragment of ironstone concretion cup which was used as a small paint bowl. 
Has two curious projections on the lip. Edge partly worked, partly fractures. 
Blackish chocolate color. This specimen may have been through fire; it looks 
as if the surface has been fluxed down a bit on the outside and there are many 
vesicles visible. 80.5 mm. diameter, 35 mm. high, walls about 8 mm. thick. 
Concavity 28 mm. (Pl. 16, h.) 
Ironstone concretion cup. Lip ground off square. 22 mm. diameter, 10 mm. 
high; concavity 7.5 mm. deep. Symmetrical and prettily made. 
Ironside concretion cup. Lip ground off square. 32 mm. diameter, 10 mm. 
high; concavity only 5 mm. deep. The rim is about 3 mm. wide. (PI. 16, f.) 
Ironstone concretion cup, the rim of which consists of an unworked square 
fracture. 28 mm. diameter, 12 mm. high; concavity 6 mm. deep. 
Fragment of ironstone concretion cup, consisting of nearly half of original 
specimen; 61 mm. diameter, 20 mm. high; rim squared and 13 mm. diameter. 
The bottom of the fragment tapers to a thin edge. There are traces of red 
paint on the inside of the cup fragment. (Pl. 16, e.) 
Ironstone concretion cup, identified as impure lamanite; 48 mm. diameter, 
15.5 mm. high; concavity 9.5 mm. deep. The rim is ground more or less 
squared. 
Ironstone concretion cup, 28 mm. diameter, 10 mm. high; concavity 7 mm. 
deep. Rim squared. About one-third of the rim is broken off with a straight 
