mica is used as [role]
作物质名词时通常不可数；as 后接用途或角色。
Mica is used as a dielectric in capacitors.
云母在电容器中用作电介质。
云母
micas — plural of mica
云母,一类含水铝硅酸盐矿物,具有极完全解理,易剥离成薄而有弹性的叶片。；由铝或钾等的含水硅酸盐组成的各种矿物,结晶成允许完美剥离成非常薄的片状；因其抗电性而用作电介质；云母；[化] 云母
any of various minerals that split easily into very thin leaves and are used as electrical insulators
云母,一类含水铝硅酸盐矿物,具有极完全解理,易剥离成薄而有弹性的叶片。
Any of a group of hydrous aluminosilicate minerals characterized by highly perfect cleavage, so that they readily separate into very thin leaves, more or less elastic.
由铝或钾等的含水硅酸盐组成的各种矿物,结晶成允许完美剥离成非常薄的片状；因其抗电性而用作电介质
any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity
The geologist showed us a thin sheet of mica that glittered in the sunlight.
地质学家向我们展示了一片在阳光下闪闪发光的薄云母片。
用法提示：句中mica为不可数名词，指云母这种矿物材料。
Old stoves often had small windows made of mica because it could withstand high heat.
旧式炉子常用云母做小窗，因为它能耐受高温。
用法提示：mica在此作不可数名词，表示制作材料。
These micas split into such thin layers that you can see light through them.
这些云母能裂成薄得可以透光的薄片。
用法提示：micas为mica的复数形式，指不同种类或片状的云母。
作物质名词时通常不可数；as 后接用途或角色。
Mica is used as a dielectric in capacitors.
云母在电容器中用作电介质。
用 a sheet of 表示数量，mica 仍为不可数名词。
A thin sheet of mica can be split into layers.
薄片云母可以分成多层。
micas 指云母的不同种类，用作可数名词复数。
Micas are hydrous silicates of aluminum or potassium.
云母是铝或钾的水合硅酸盐。
isinglass 是云母的一种（白云母），尤指透明薄片，多用于旧时书面语；现代英语中很少用，且该词也指鱼胶（明胶），需根据语境区分。
grammar · medium
易错句子Mica are a kind of mineral.
正确表达Mica is a kind of mineral.
mica 作物质名词时是不可数名词，作主语时谓语动词用单数；只有表示不同种类时才用复数 micas。
grammar · medium
易错句子How many mica do we need for the experiment?
正确表达How much mica do we need for the experiment?
mica 指材料本身时不可数，疑问词应用 how much；how many 只能修饰可数名词复数。
mica 指矿物“云母”；Micah 是人名“迈卡”，两者发音相同但拼写、大小写和词性完全不同。
云母片
The electrician placed a mica sheet between the contacts to prevent arcing.
电工在触点之间放置了一片云母片以防电弧。
云母粉
Mica powder is often added to paint for a pearlescent finish.
云母粉常被加入油漆中以获得珠光效果。
云母绝缘材料
Mica insulation is valued for its high heat resistance in industrial motors.
云母绝缘材料因其耐高温性而受到工业电机领域的重视。
云母片（薄片状）
The rock contained shiny mica flakes that sparkled in the sunlight.
这块岩石含有在阳光下闪闪发光的云母片。
云母电容器
A mica capacitor offers stable performance at high frequencies.
云母电容器在高频下具有稳定的性能。
云母属于硅酸盐类矿物，常与石英、长石等共生。
常见的造岩矿物，常与云母一同出现在花岗岩等岩石中。
与云母共生的常见造岩矿物，共同构成多种岩石。
云母具有极完全解理，可剥成极薄的片状。
云母因电阻高、耐电击穿而常被用作电介质材料。
Dictionary facts from ECDICT, WIKTIONARY.