hydromica
水云母
水云母
Hydromica \
Hy `
dro *
mi "
ca \,
n . [
Hydro -,
1 mica .] (
Min .)
A variety of potash mica containing water .
It is less elastic than ordinary muscovite .
[
1913 Webster ]
{
Hydromica schist } (
Min .),
a mica schist characterized by the presence of hydromica .
It often has a silky luster and almost soapy feel .
[
1913 Webster ]
Mica \
Mi "
ca \,
n . [
L .
mica crumb ,
grain ,
particle ;
cf .
F .
mica .]
(
Min .)
The name of a group of minerals characterized by highly perfect cleavage ,
so that they readily separate into very thin leaves ,
more or less elastic .
They differ widely in composition ,
and vary in color from pale brown or yellow to green or black .
The transparent forms are used in lanterns ,
the doors of stoves ,
etc .,
being popularly called {
isinglass }.
Formerly called also {
cat -
silver },
and {
glimmer }.
[
1913 Webster ]
Note :
The important species of the mica group are :
{
muscovite },
common or potash mica ,
pale brown or green ,
often silvery ,
including {
damourite } (
also called {
hydromica }
and {
muscovy glass }); {
biotite },
iron -
magnesia mica ,
dark brown ,
green ,
or black ;
{
lepidomelane },
iron ,
mica ,
black ; {
phlogopite },
magnesia mica ,
colorless ,
yellow ,
brown ; {
lepidolite },
lithia mica ,
rose -
red ,
lilac .
[
1913 Webster ]
Mica (
usually muscovite ,
also biotite )
is an essential constituent of granite ,
gneiss ,
and mica slate ; {
biotite }
is common in many eruptive rocks ;
{
phlogopite }
in crystalline limestone and serpentine .
[
1913 Webster ]
{
Mica diorite } (
Min .),
an eruptive rock allied to diorite but containing mica (
biotite )
instead of hornblende .
{
Mica powder },
a kind of dynamite containing fine scales of mica .
{
Mica schist }, {
Mica slate } (
Geol .),
a schistose rock ,
consisting of mica and quartz with ,
usually ,
some feldspar .
[
1913 Webster ]
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