Based on the characteristics you provided, it seems you are describing a type of rock that likely has the following features:
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Streak: This can refer to the color of the rock powder when scraped on a streak plate, but you didn't specify a color, just that it may not have a notable streak.
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Non-Magnetic: This indicates the rock likely does not contain iron-bearing minerals.
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Float/Sink: Since it sinks, it indicates the rock is denser than water.
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Mass: A mass of 13.7 g gives some perspective on the size or amount of material being evaluated.
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Reaction to HCL (hydrochloric acid): No reaction suggests that the rock does not contain significant amounts of carbonate minerals (such as calcite or limestone, which typically fizz in the presence of HCL).
Based on these characteristics, the rock in question could be a type of igneous, sedimentary, or metamorphic rock that lacks carbonate minerals. Some possibilities include:
- Granite (an igneous rock): It's non-magnetic, it sinks, and it typically doesn't react with HCl.
- Basalt (another igneous rock): Also non-magnetic at times, sinks, and does not react with HCl.
- Certain sedimentary rocks such as shale or sandstone: These might exhibit the same properties if they are primarily silicate-based without carbonate content.
- Metamorphic rocks such as schist or gneiss could also meet these criteria.
If you can provide more specific features like color, texture, or grain size, a more precise identification could be made.