Name: 岩石と鉱物の識別 (Rock and Mineral Identification)
Uploaded: 2021-01-14T05:34:23.000Z
Duration: 19 min 17 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

We have a rock and mineral ID test coming up

Quartz has a hardness of 7 and is the hardest mineral in this set

But be careful because quartz can be almost any colour

No cleavage but is sometimes in crystal form

It has sharp edges and is a common rock forming mineral

Has a hardness of 3 and can be scratched with a knife

It's lustre is vitreous to earthy and non metallic

and effervesces with a dilute ten percent HCL

Has a hardness of 6 and a non metallic lustre

It streaks white and has good cleavage at right angles

It's usually light in colour white or grey

It streaks white it has good cleavage at 90 degrees

Colour is most often light to medium red but

With a hardness of 2.5 to 3 it's very soft

Splits off easily into thin sheets that are

With a hardness of 5.5 it's as hard as a knife

It has a bright black splintery appearance

Angles fifty six degrees and one hundred twenty four degrees

The colour is black to dark green or brown

Hardness of 5.5 same hardness as a knife blade

The lustre is vitreous to glassy and non metallic

The colour is light to medium grey or green

has visible cleavage plains at approximately ninety degrees

The streak is white the lustre is pearly to greasy

non metallic silky appearance slippery to the touch

Colour is pale green white yellow or translucent

Hardness of 6 to 6.5 it's harder than a knife blade

The lustre is metallic it has no cleavage

It's hardness is 3.5 to 4 softer than a knife blade

Found in compact red earthy masses but can

The colours are red reddish brown black or metallic steel grey

With a hardness of 6 it can't be scratched with a knife

It's lustre is sub metallic dull metal appearance

With a hardness of 2 it scratches easily with a fingernail

字幕リスト動画再生

岩石と鉱物の識別 (Rock and Mineral Identification)

massive

structure

texture

medium