Question

Which is a special property of the mineral magnetite? A. attracted by a magnet B. fizzes with dilute hydrochloric acid C. forms a double image D. has a salty taste

Short answer

A (attracted by a magnet) is the special property of magnetite.

Step-by-step solution

Identify the Option Related to Magnetite

The mineral magnetite is known for its magnetic properties. It's important to know what characteristic is typically associated with magnetite in order to identify the correct answer from the options given.

Evaluate Each Option Based on Magnetite's Known Properties

Option A states that the mineral is attracted by a magnet. This directly relates to the well-known property of magnetite being magnetic, as magnetite is composed of iron oxide. Option B suggests magnetite fizzes with dilute hydrochloric acid, which is a characteristic of calcite, not magnetite. Option C, forms a double image, is a property of calcite crystals known as double refraction, not related to magnetite. Option D, having a salty taste, applies to minerals like halite, not magnetite.

Select the Correct Option

After evaluating all the options: - Option A (attracted by a magnet) correctly describes magnetite's property. - The other options describe characteristics of different minerals such as calcite and halite.

Key concepts

Mineral Properties

Minerals are naturally occurring, inorganic substances with specific physical and chemical properties. Each mineral exhibits distinct properties that can help identify it. These properties include color, streak, hardness, cleavage, luster, and specific gravity. There are other unique properties like magnetism, reaction to acid, and taste, which are not common but can be crucial in identifying certain minerals.
Magnetite, for instance, is an iron oxide mineral known for its strong magnetic property. This specific characteristic helps differentiate magnetite from other non-magnetic minerals. Identifying the right properties requires observation and sometimes simple tests, such as using a magnet for magnetism or acid for chemical reaction.
Understanding these properties allows geologists and students alike to classify and identify minerals effectively. Thus, knowing which tests to apply to which mineral is key to uncovering its identity.

Magnetic Minerals

Magnetic minerals have the unique ability to attract or be attracted by a magnet. This property is due to the presence of iron or other magnetic metals within the mineral's structure. Most notable amongst these is magnetite, a mineral which has incredibly strong magnetic properties due to its composition of iron oxide.
Magnetite is not only attracted to magnets, but it can also become magnetized itself, making it an essential mineral in the study of magnetism. It's often used to illustrate magnetic properties in educational settings. Other minerals like hematite and pyrrhotite also exhibit magnetic characteristics, but with less intensity compared to magnetite.

• Magnetite is the most magnetic natural mineral found on Earth.
• Its magnetic characteristics can help locate iron ore deposits.

The presence of these properties in a mineral can make it useful for various technological applications, including navigational aids in compasses and in metallurgy.

Iron Oxide

Iron oxides are chemical compounds made up of iron and oxygen. They occur naturally in the environment and play significant roles in geological and biological processes. The most well-known iron oxides include magnetite ( Fe_3O_4 ) and hematite ( Fe_2O_3 ). These compounds contribute to the red and brown hues in soils and sediments.
Among these, magnetite is a notable iron oxide, recognized for its strong magnetic qualities. It is an essential component of iron ore, which is mined for iron production. Functioning as both an oxidizing agent and a ferrous precursor, magnetite is applicable in various industrial processes.

• Iron oxides like magnetite are crucial for iron and steel production.
• These compounds are also utilized in pigments and coatings.

Understanding the role of iron oxides in nature and industry highlights their importance not only in mineral identification but also in broader ecological and industrial contexts.