geyserite
硅华; 硅华
矽华; 矽华
Geyserite \
Gey "
ser *
ite \ (
g [
imac ]"
z [~
e ]
r *[
imac ]
t or g [
imac ]"
s [~
e ]
r *[
imac ]
t ;
277 ),
n . [
From {
Geyser }.] (
Min .)
A loose hydrated form of silica ,
a variety of opal ,
deposited in concretionary cauliflowerlike masses ,
around some hot springs and geysers .
[
1913 Webster ]
Opal \
O "
pal \,
n . [
L .
opalus :
cf .
Gr . ?,
Skr .
upala a rock ,
stone ,
precious stone :
cf .
F .
opale .] (
Min .)
A mineral consisting ,
like quartz ,
of silica ,
but inferior to quartz in hardness and specific gravity .
[
1913 Webster ]
Note :
The {
precious opal }
presents a peculiar play of colors of delicate tints ,
and is highly esteemed as a gem .
One kind ,
with a varied play of color in a reddish ground ,
is called the {
harlequin opal }.
The {
fire opal }
has colors like the red and yellow of flame . {
Common opal }
has a milky appearance . {
Menilite }
is a brown impure variety ,
occurring in concretions at Menilmontant ,
near Paris .
Other varieties are {
cacholong }, {
girasol },
{
hyalite },
and {
geyserite }.
[
1913 Webster ]
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